CN113087902B - Bitetrazole-based porous organic polymer and preparation method and application thereof - Google Patents
Bitetrazole-based porous organic polymer and preparation method and application thereof Download PDFInfo
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- 229920000620 organic polymer Polymers 0.000 title claims abstract description 76
- YTNLBRCAVHCUPD-UHFFFAOYSA-N 5-(1$l^{2},2,3,4-tetrazol-5-yl)-1$l^{2},2,3,4-tetrazole Chemical compound [N]1N=NN=C1C1=NN=N[N]1 YTNLBRCAVHCUPD-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- BTJIUGUIPKRLHP-UHFFFAOYSA-N 4-nitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1 BTJIUGUIPKRLHP-UHFFFAOYSA-N 0.000 claims abstract description 30
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052740 iodine Inorganic materials 0.000 claims abstract description 27
- 239000011630 iodine Substances 0.000 claims abstract description 27
- 238000010534 nucleophilic substitution reaction Methods 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 8
- 239000011540 sensing material Substances 0.000 claims abstract description 8
- 239000002250 absorbent Substances 0.000 claims abstract description 7
- 230000002745 absorbent Effects 0.000 claims abstract description 7
- MGNCLNQXLYJVJD-UHFFFAOYSA-N cyanuric chloride Chemical compound ClC1=NC(Cl)=NC(Cl)=N1 MGNCLNQXLYJVJD-UHFFFAOYSA-N 0.000 claims abstract description 5
- ZKTARFAXHMRZEF-UHFFFAOYSA-N azane;5-(2h-tetrazol-5-yl)-2h-tetrazole Chemical compound N.N.N1N=NC(C2=NNN=N2)=N1 ZKTARFAXHMRZEF-UHFFFAOYSA-N 0.000 claims abstract description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 36
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 18
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 12
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 6
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 3
- 239000007810 chemical reaction solvent Substances 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- NGRXSVVLBWDAHG-UHFFFAOYSA-N n,n-bis(propan-2-ylamino)ethanamine Chemical compound CC(C)NN(CC)NC(C)C NGRXSVVLBWDAHG-UHFFFAOYSA-N 0.000 claims 1
- REJGOFYVRVIODZ-UHFFFAOYSA-N phosphanium;chloride Chemical compound P.Cl REJGOFYVRVIODZ-UHFFFAOYSA-N 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000035945 sensitivity Effects 0.000 abstract description 7
- -1 phosphine cyanuric chloride Chemical compound 0.000 abstract description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 24
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 15
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 9
- 238000000295 emission spectrum Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 6
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 6
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 description 6
- 239000004815 dispersion polymer Substances 0.000 description 5
- OXNIZHLAWKMVMX-UHFFFAOYSA-N picric acid Chemical compound OC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O OXNIZHLAWKMVMX-UHFFFAOYSA-N 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 239000012153 distilled water Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000012621 metal-organic framework Substances 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- WDCYWAQPCXBPJA-UHFFFAOYSA-N 1,3-dinitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC([N+]([O-])=O)=C1 WDCYWAQPCXBPJA-UHFFFAOYSA-N 0.000 description 3
- FYFDQJRXFWGIBS-UHFFFAOYSA-N 1,4-dinitrobenzene Chemical compound [O-][N+](=O)C1=CC=C([N+]([O-])=O)C=C1 FYFDQJRXFWGIBS-UHFFFAOYSA-N 0.000 description 3
- DYSXLQBUUOPLBB-UHFFFAOYSA-N 2,3-dinitrotoluene Chemical compound CC1=CC=CC([N+]([O-])=O)=C1[N+]([O-])=O DYSXLQBUUOPLBB-UHFFFAOYSA-N 0.000 description 3
- IQUPABOKLQSFBK-UHFFFAOYSA-N 2-nitrophenol Chemical compound OC1=CC=CC=C1[N+]([O-])=O IQUPABOKLQSFBK-UHFFFAOYSA-N 0.000 description 3
- RTZZCYNQPHTPPL-UHFFFAOYSA-N 3-nitrophenol Chemical compound OC1=CC=CC([N+]([O-])=O)=C1 RTZZCYNQPHTPPL-UHFFFAOYSA-N 0.000 description 3
- ZPTVNYMJQHSSEA-UHFFFAOYSA-N 4-nitrotoluene Chemical compound CC1=CC=C([N+]([O-])=O)C=C1 ZPTVNYMJQHSSEA-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000002189 fluorescence spectrum Methods 0.000 description 3
- 238000003760 magnetic stirring Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
- 239000011541 reaction mixture Substances 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000012265 solid product Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- UFBJCMHMOXMLKC-UHFFFAOYSA-N 2,4-dinitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O UFBJCMHMOXMLKC-UHFFFAOYSA-N 0.000 description 2
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 description 2
- QMKBSUASRATAHH-UHFFFAOYSA-N N.N.N1=NN=NC1=C1N=NN=N1 Chemical compound N.N.N1=NN=NC1=C1N=NN=N1 QMKBSUASRATAHH-UHFFFAOYSA-N 0.000 description 2
- 239000013317 conjugated microporous polymer Substances 0.000 description 2
- 239000013310 covalent-organic framework Substances 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical group C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000000695 excitation spectrum Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000013312 porous aromatic framework Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 150000003536 tetrazoles Chemical class 0.000 description 2
- KJUGUADJHNHALS-UHFFFAOYSA-N 1H-tetrazole Substances C=1N=NNN=1 KJUGUADJHNHALS-UHFFFAOYSA-N 0.000 description 1
- MGDCPRXEOXKHBI-UHFFFAOYSA-N 2-ethyl-1,1-di(propan-2-yl)hydrazine Chemical compound CCNN(C(C)C)C(C)C MGDCPRXEOXKHBI-UHFFFAOYSA-N 0.000 description 1
- 101710205482 Nuclear factor 1 A-type Proteins 0.000 description 1
- 101710170464 Nuclear factor 1 B-type Proteins 0.000 description 1
- 102100022162 Nuclear factor 1 C-type Human genes 0.000 description 1
- 101710113455 Nuclear factor 1 C-type Proteins 0.000 description 1
- 101710140810 Nuclear factor 1 X-type Proteins 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000011960 computer-aided design Methods 0.000 description 1
- 239000013311 covalent triazine framework Substances 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007210 heterogeneous catalysis Methods 0.000 description 1
- 239000013315 hypercross-linked polymer Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- OCVXZQOKBHXGRU-UHFFFAOYSA-N iodine(1+) Chemical compound [I+] OCVXZQOKBHXGRU-UHFFFAOYSA-N 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000013316 polymer of intrinsic microporosity Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000003831 tetrazolyl group Chemical group 0.000 description 1
- 125000004306 triazinyl group Chemical group 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- C08G73/0622—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms
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- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
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Abstract
The invention discloses a bitetrazole-based porous organic polymer. The invention also discloses a preparation method of the bitetrazole-based porous organic polymer, which comprises the following steps: taking a substance A and 5,5' -bitetrazole diammonium salt, and carrying out nucleophilic substitution reaction in the presence of an acid absorbent to obtain the bitetrazole-based porous organic polymer, wherein the substance A is cyanuric chloride or phosphine cyanuric chloride. The invention also discloses application of the bitetrazole-based porous organic polymer as a fluorescent sensing material. The invention prepares the bitetrazole-based porous organic polymer with fluorescent property by nucleophilic substitution reaction by using a proper structural building block, can be used as a fluorescent sensing material, and can selectively sense elemental iodine or p-nitrophenol in a fluorescent manner under the condition that other substances exist; the detection method has high sensitivity and good selectivity.
Description
Technical Field
The invention relates to the technical field of fluorescence sensing detection, in particular to a bitetrazole-based porous organic polymer and a preparation method and application thereof.
Background
As a new generation of organic polymers with high stability and intrinsic porosity, porous Organic Polymers (POPs) can be designed, which are attracting great attention in academia and industry due to their potential application prospects in heterogeneous catalysis, gas separation and storage, electrical conductivity and photoelectron, fluorescence sensing, etc. In order to meet the application requirements, it is necessary to optimize the structure and function of the porous organic polymer by reasonably selecting structural blocks and polymerization reactions. To date, various porous organic polymers have been reported for fluorescent sensing of electron deficient analytes, such as Conjugated Microporous Polymers (CMPs) (j.am.chem.soc.2012, 134,8738-8741; j.am.chem.soc.2013,135,8357-8362; j.am.chem.soc.2014,136,2818-2824; adv.funct.mater.2020, 1910275), porous Aromatic Frameworks (PAFs) (j.am.chem.soc., 2016,138,7603), covalent Organic Frameworks (COFs) (j.am.chem.soc.2013, 135,17310-17313; j.am.chem.soc.2016,138,3031-3037; j.am.chem.soc.2016,138,3302-3305; j.am.chem.c.soc, soc.2017,139 (6), 2421-2427; J.am.chem.Soc.2017,139 (25), 8698-8704), super cross-linked polymers (HCPs) (Eur.Polym.J., 130 (2020) 109674), covalent triazinyl backbones (CTFs) (J.Mater.chem.A, 2017,5,7612-7617; macromolecules,2017,50 (21), 8512-8520; J.Mater.chem.A,2020,8, 2820-2826), self-contained microporous Polymers (PIMs) and Porous Polymer Networks (PPN), and the like. Research shows that introducing nitrogen atoms into the porous organic skeleton to construct POPs rich in nitrogen atoms can endow the material with more functions.
Tetrazolyl metal-organic frameworks (MOFs) have fluorescence properties due to conjugated fluorophores and abundant nitrogen atoms (science bulletins, 2014,59 (15), 1423-1428; inorganic chemistry bulletins, 2014,30 (6), 1367-1372), and can be used for fluorescence sensing of metal ions (applied chemistry, 2017,34 (9), 1046-1051). However, the main disadvantage of the existing nanoporous metal-organic frameworks is their poor physicochemical stability.
Unlike most MOFs, porous organic polymers exhibit exceptional thermal and hydrothermal stability. However, tetrazole-based porous organic polymers have been less studied. The Jiang group of california university has proposed a new porous aromatic skeleton containing tetrazoles by introducing nitrogen-containing groups into biphenyl units, modeling and predicting their CO with monte carlo using computer aided design 2 Adsorption capacity (J.colloid Interf.Sci.438 (2015) 191-195). At present, reports of bitetrazole-based porous organic polymers are not yet seen.
Disclosure of Invention
Based on the technical problems existing in the background technology, the invention provides a bitetrazole-based porous organic polymer, a preparation method and application thereof, and the bitetrazole-based porous organic polymer with fluorescence property is prepared by nucleophilic substitution reaction by using a proper structural building block, can be used as a fluorescence sensing material, and can be selected under the condition that other substances existSensing elemental iodine (I) 2 ) Or p-nitrophenol (p-NP); the detection method has high sensitivity and good selectivity.
The invention provides a bitetrazole-based porous organic polymer, which has a structure shown in a formula (I) or a formula (II):
the invention also provides a preparation method of the bitetrazole-based porous organic polymer, which comprises the following steps: taking a substance A and 5,5' -bitetrazole diammonium salt, and carrying out nucleophilic substitution reaction in the presence of an acid absorbent to obtain the bitetrazole-based porous organic polymer, wherein the substance A is cyanuric chloride or phosphine cyanuric chloride.
Preferably, the nucleophilic substitution reaction is performed in an inert gas atmosphere.
Preferably, the temperature of the nucleophilic substitution reaction is 60-140 ℃.
Preferably, the nucleophilic substitution reaction time is 24-96 hours.
Preferably, the molar ratio of the substance A, the 5,5' -bitetrazolium diammonium salt and the acid absorbent is (1-99): 1.5-300): 6-600.
Preferably, the molar ratio of the substance A, the 5,5' -bitetrazolium diammonium salt and the acid absorbent is 1 (1.5-3.03): 6-13.
Preferably, the acid absorber is at least one of triethylamine, N-diisopropylamino ethylamine.
Preferably, the reaction solvent is at least one of acetonitrile, tetrahydrofuran, 1, 4-dioxane, and N, N-dimethylformamide.
After the nucleophilic substitution reaction, purifying to obtain the bitetrazole-based porous organic polymer, wherein the purifying method comprises the following steps: after nucleophilic substitution reaction, solid-liquid separation, washing solid, extraction and drying to obtain bitetrazole-based porous organic polymer; the drying mode is preferably vacuum drying, and the drying temperature is preferably 50-150 ℃; the extraction time may be 24 hours.
The washing solvent may be distilled water, ethanol, methylene chloride, tetrahydrofuran, etc.; the extraction solvent may be ethanol, dichloromethane, tetrahydrofuran, etc.
The invention also discloses application of the bitetrazole-based porous organic polymer as a fluorescent sensing material.
Preferably, the bitetrazolyl porous organic polymer is used as a fluorescent sensing material for fluorescent sensing of elemental iodine or p-nitrophenol.
The bitetrazole-based porous organic polymer can selectively sense elemental iodine or p-nitrophenol through fluorescence under the condition that other substances exist, and has good sensitivity and selectivity.
And calculating the sensitivity of the bitetrazole-based porous organic polymer to fluorescent sensing of elemental iodine and p-nitrophenol by adopting a method of drawing a Stern-Volmer curve.
The specific steps for drawing the Stern-Volmer curve are as follows:
using a fluorescence spectrophotometer to find the optimal excitation wavelength lambda by a continuous excitation-emission process ex At the excitation wavelength, measuring the fluorescence emission spectrum of the bitetrazole-based porous organic polymer dispersion liquid, and selecting the fluorescence intensity at the highest emission peak as I 0 The method comprises the steps of carrying out a first treatment on the surface of the Gradually dripping an elemental iodine solution or a p-nitrophenol solution, measuring a fluorescence emission spectrum after uniformly mixing each dripping, and selecting the fluorescence intensity at the highest emission peak as I; with relative fluorescence intensity (I) 0 I) is the ordinate, the concentration of elemental iodine or p-nitrophenol in the bitetrazole-based porous organic polymer dispersion is the abscissa, a Stern-Volmer curve is drawn, a straight line part is taken, and a Stern-Volmer equation is obtained, wherein the slope is the Stern-Volmer constant (K) SV )。
In the bitetrazole-based porous organic polymer dispersion liquid, the concentration of the bitetrazole-based porous organic polymer is 0.01-1.0mg/mL; preferably 0.1mg/mL.
The solvent type of the bitetrazole-based porous organic polymer dispersion is not limited, and a solvent which can dissolve elemental iodine and p-nitrophenol, uniformly disperse the bitetrazole-based porous organic polymer and has high fluorescence intensity can be selected.
In the steps, a fluorescence spectrophotometer is used for detection, the detection voltage is 220-700V, and the slit width is 5-20nm.
The beneficial effects are that:
the invention selects proper structural building blocks, prepares the bitetrazole-based porous organic polymer with fluorescence performance through nucleophilic substitution reaction, can be used as a fluorescence sensing material, and can selectively sense elemental iodine and p-nitrophenol in a fluorescence manner under the condition that other substances exist; the detection method is simple and convenient to operate, visual in signal, high in sensitivity and good in selectivity, and can be used for in-situ detection in real time.
Drawings
FIG. 1 is a graph showing the emission spectrum and the excitation spectrum of the bitetrazole-based porous organic polymer TBTZ of example 1 in tetrahydrofuran.
FIG. 2 is a graph showing the results of iodine quenching of the bitetrazole-based porous organic polymer TBTZ of example 1, wherein (a) is a graph showing the emission spectrum of the iodine quenched bitetrazole-based porous organic polymer TBTZ in tetrahydrofuran; (b) Is a Stern-Volmer curve of an iodine quenched bitetrazole-based porous organic polymer TBTZ in tetrahydrofuran.
FIG. 3 is a graph showing the emission spectrum of the bitetrazole-based porous organic polymer HBTZ of p-nitrophenol quenching example 2, wherein (a) is a graph showing the emission spectrum of the bitetrazole-based porous organic polymer HBTZ in N, N-dimethylformamide; (b) The Stern-Volmer curve of the bitetrazole-based porous organic polymer HBTZ in N, N-dimethylformamide was quenched for p-nitrophenol.
FIG. 4 is a bar graph of the effect of elemental iodine, nitroaromatic compounds, or phenol on the relative fluorescence intensity of the bitetrazole-based porous organic polymers of examples 1 and 2, wherein (a) is example 1 and (b) is example 2.
FIG. 5 shows the results of selective fluorescence sensing of elemental iodine or p-nitrophenol by the bitetrazole-based porous organic polymers of examples 1 and 2, wherein (a) is example 1 and (b) is example 2.
Detailed Description
The technical scheme of the invention is described in detail through specific embodiments.
Example 1
A method for preparing a bitetrazole-based porous organic polymer, comprising the following steps:
cyanuric chloride (TCT, 0.5554g,3.0 mmol) was rapidly weighed and added to an N 2 A filled 100mL two-necked round bottom flask was equipped with a magnetic stirring bar and condenser; then 5,5' -bitetrazoldiammonium salt (TBZ, 0.7919g,4.5 mmol) was added; a mixture of triethylamine (2.70 mL,19.5 mmol) and tetrahydrofuran (48 mL) was then transferred to a round bottom flask; placing the flask in an oil bath, raising the bath temperature to 80 ℃, stirring and refluxing the reaction mixture for 72 hours, cooling, filtering, and washing the solid product with distilled water, ethanol and tetrahydrofuran for three times respectively; extracting with ethanol, tetrahydrofuran and dichloromethane in Soxhlet extractor for 24 hr, and drying at 50deg.C in vacuum drying oven to obtain bitetrazole-based porous organic polymer as pale yellow powder, and recording as TBTZ.
Experiment 1
The simple substance iodine is subjected to fluorescence sensing by adopting the bitetrazole-based porous organic polymer TBTZ prepared in the example 1, and the result is shown in figures 1-2. FIG. 1 is a graph showing the emission spectrum and excitation spectrum of the bitetrazole-based porous organic polymer TBTZ of example 1 in tetrahydrofuran; FIG. 2 is a graph showing the results of iodine quenching of the bitetrazole-based porous organic polymer TBTZ of example 1, wherein (a) is a graph showing the emission spectrum of the iodine quenched bitetrazole-based porous organic polymer TBTZ in tetrahydrofuran; (b) Is a Stern-Volmer curve of an iodine quenched bitetrazole-based porous organic polymer TBTZ in tetrahydrofuran.
As can be seen from FIG. 2, the relative fluorescence intensity of the bitetrazole-based porous organic polymer TBTZ to the elemental iodine and the concentration of the elemental iodine show good linear relation, and the Stern-Volmer constant K SV Up to 1.67×10 4 L/mol shows that the bitetrazolyl porous organic polymer TBTZ can sense elemental iodine by fluorescence and has high sensitivity.
Example 2
A method for preparing a bitetrazole-based porous organic polymer, comprising the following steps:
quick weighing of the phosphine cyanuric chloride (HCCP, 1.0430g,3.0 mmol) and addition toN is N 2 A 150mL two-necked round bottom flask was filled with a magnetic stirring bar and condenser; then 5,5' -bitetrazoldiammonium salt (TBZ, 1.5839g,9.0 mmol) was added; a mixture of triethylamine (5.40 mL,39 mmol) and tetrahydrofuran (96 mL) was then transferred to a round bottom flask; placing the flask in an oil bath, raising the bath temperature to 80 ℃, stirring and refluxing the reaction mixture for 72 hours, cooling, filtering, and washing the solid product with distilled water, ethanol and tetrahydrofuran for three times respectively; extracting with ethanol, tetrahydrofuran and dichloromethane in Soxhlet extractor for 24 hr, and drying at 50deg.C in vacuum drying oven to obtain the final product.
Experiment 2
Fluorescence sensing is carried out on the bitetrazole-based porous organic polymer HBTZ p-nitrophenol prepared in example 2, and the result is shown in figure 3. FIG. 3 is a graph showing the emission spectrum of the bitetrazole-based porous organic polymer HBTZ of p-nitrophenol quenching example 2, wherein (a) is a graph showing the emission spectrum of the bitetrazole-based porous organic polymer HBTZ in N, N-dimethylformamide; (b) The Stern-Volmer curve of the bitetrazole-based porous organic polymer HBTZ in N, N-dimethylformamide was quenched for p-nitrophenol.
As can be seen from FIG. 3, the relative fluorescence intensity of the bitetrazole-based porous organic polymer HBTZ p-nitrophenol and the concentration of p-nitrophenol show good linear relation, and the Stern-Volmer constant K SV Up to 5.89×10 4 L/mol shows that the bitetrazolyl porous organic polymer HBTZ can sense p-nitrophenol by fluorescence and has high sensitivity.
Experiment 3
The bitetrazole-based porous organic polymers TBTZ and HBTZ prepared in example 1 and example 2 were taken and subjected to fluorescence sensing on elemental iodine, nitroaromatic compounds (NACs for short) and phenol (PhOH), wherein the nitroaromatic compounds are as follows: dinitrotoluene (DNT), m-dinitrobenzene (m-DNB), nitrobenzene (NB), o-nitrophenol (o-NP), p-nitrotoluene (p-NT), picric Acid (PA), p-dinitrobenzene (p-DNB), p-nitrophenol (p-NP), m-nitrophenol (m-NP), 2, 4-Dinitrophenol (DNP).
The specific detection method comprises the following steps:
adding proper amount of 0.1mol/L elemental iodine, nitroaromatic compound or phenol solution into 0.1mg/mL bitetrazole-based porous organic polymer dispersion, and mixing to obtain TBTZ dispersion with elemental iodine, nitroaromatic compound or phenol concentration of 2.5X10 -4 mol/L to make the concentration of elemental iodine, nitroaromatic compound or phenol in HBTZ dispersion liquid 1.0X10 -4 mol/L, fluorescence emission spectra were tested, and test results were recorded.
The specific test results are shown in FIG. 4, and FIG. 4 is a bar graph of the effect of elemental iodine, nitroaromatic compounds or phenol on the relative fluorescence intensity of the bitetrazole-based porous organic polymers of examples 1 and 2, wherein (a) is example 1 and (b) is example 2.
As can be seen from fig. 4, other nitroaromatics and phenol, in addition to picric acid, p-nitrophenol, had less effect on the fluorescence intensity of TBTZ described in example 1; in addition to picric acid and dinitrophenol, other nitroaromatic compounds and phenol had less effect on the fluorescence intensity of HBTZ as described in example 2. The bitetrazole-based porous organic polymers described in example 1 and example 2 are shown to have excellent selectivity for elemental iodine or p-nitrophenol.
Experiment 4
The results of taking the bitetrazole-based porous organic polymers TBTZ, HBTZ, fluorescence sensing elemental iodine or p-nitrophenol in example 1 and example 2 and the competition of elemental iodine and p-nitrophenol in the presence of other nitroaromatics (such as DNT, m-DNB, NB, o-NP, p-NT, PA, p-DNB, m-NP, DNP) are shown in FIG. 5.
FIG. 5 shows the results of selective fluorescence sensing of elemental iodine or p-nitrophenol by the bitetrazole-based porous organic polymers of examples 1 and 2, wherein (a) is example 1 and (b) is example 2.
As can be further seen from fig. 5, when elemental iodine or p-nitrophenol is present with other nitroaromatic compounds, the fluorescence intensity does not significantly change from that of elemental iodine or p-nitrophenol alone; the bitetrazole-based porous organic polymers described in example 1 and example 2 have excellent selectivity to elemental iodine or p-nitrophenol.
Example 3
A method for preparing a bitetrazole-based porous organic polymer, comprising the following steps:
cyanuric chloride (TCT, 0.5554g,3.0 mmol) was rapidly weighed and added to an N 2 A filled 100mL two-necked round bottom flask was equipped with a magnetic stirring bar and condenser; then 5,5' -bitetrazoldiammonium salt (TBZ, 0.7919g,4.5 mmol) was added; subsequently, a mixture of N, N-diisopropylethylamine (3.22 mL,19.5 mmol) and 1, 4-dioxane (48 mL) was transferred to a round bottom flask; placing the flask in an oil bath, raising the temperature of the bath to 120 ℃, stirring and refluxing the reaction mixture for 48 hours, cooling, filtering and separating a solid product, and respectively washing with distilled water, ethanol and tetrahydrofuran three times; extracting the powder with ethanol, tetrahydrofuran and dichloromethane in Soxhlet extractor for 24 hr, and drying at 100deg.C in vacuum drying oven to obtain the final product.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. A bitetrazole-based porous organic polymer is characterized in that the structure is shown as a formula (I) or a formula (II):
2. a method for preparing the bitetrazole-based porous organic polymer according to claim 1, comprising the steps of: taking a substance A and 5,5' -bitetrazole diammonium salt, and carrying out nucleophilic substitution reaction in the presence of an acid absorbent to obtain a bitetrazole-based porous organic polymer, wherein the substance A is cyanuric chloride or cyanuric phosphine chloride; the mol ratio of the substance A to the 5,5' -bitetrazole diammonium salt to the acid absorbent is (1-99): 1.5-300): 6-600.
3. The method for preparing a bitetrazole-based porous organic polymer according to claim 2, wherein the nucleophilic substitution reaction is performed in an inert gas atmosphere.
4. A process for the preparation of a bitetrazole-based porous organic polymer according to claim 2 or 3, wherein the nucleophilic substitution reaction temperature is 60-140 ℃.
5. A process for the preparation of a bitetrazole-based porous organic polymer according to claim 2 or 3, wherein the nucleophilic substitution reaction is carried out for a period of 24 to 96 hours.
6. A method for preparing a bitetrazole-based porous organic polymer according to claim 2 or 3, wherein the acid absorbent is at least one of triethylamine and N, N-diisopropylamino ethylamine.
7. The method for preparing a bitetrazole-based porous organic polymer according to claim 2 or 3, wherein the reaction solvent is at least one of acetonitrile, tetrahydrofuran, 1, 4-dioxane, and N, N-dimethylformamide.
8. Use of the bitetrazole-based porous organic polymer according to claim 1 as a fluorescent sensing material.
9. The use of the bitetrazolyl porous organic polymer according to claim 8 as a fluorescent sensing material for fluorescent sensing of elemental iodine or p-nitrophenol.
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