CN102634048A - Preparation method of photo-response type chirality intelligent nanometer particles - Google Patents
Preparation method of photo-response type chirality intelligent nanometer particles Download PDFInfo
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Abstract
The invention discloses a preparation method of photo-response type chirality intelligent nanometer particles. The preparation method is characterized by comprising the following steps of: preparing a trichloromethane solution with a repetitive unit concentration of 3*10<-2> mg/mL from a 9,9-dioctylfluorene-azobenzene alternating copolymer, wherein Mn in the 9,9-dioctylfluorene-azobenzene alternating copolymer is equal to 7770 g/mol and the ratio of Mw to Mn is equal to 2.62; uniformly mixing the solution with alcohol the volume of which is the same as that of the solution; and irradiating the mixture for 1-30 minutes by using levorotatory or dextrotatory polarized light so as to obtain left-handed helix or right-handed helix chirality nanometer particles. By using the preparation method provided by the invention, the problems that when the traditional method is adopted to synthesize the polymer chirality intelligent nanometer particles, a chiral reagent is expensive, synthetic steps are complex and the like are solved; the obtained product is alternatively irradiated by the levorotatory or dextrorotatory polarized light, thus the chiral spiral direction of the nanometer particles can be changed, so as to present the good properties of a photo switch.
Description
Technical field
The present invention relates to a kind of preparation method of photoresponse type chirality intelligent nano particle, be specifically related to left-handed/right-circularly polarized light induced nano particle and form chirality and photoresponse performance thereof.
Background technology
Left-handed/right-circularly polarized light causes that the scientific theory of chirality more and more receives the attention of scientists.At present as the cleanest and chiral source cheapness, left-handed/right-circularly polarized light has obtained using widely with asymmetric photolysis field in that asymmetric photochemistry is synthetic.Because left-handed/right-circularly polarized light chiral source self, the successful use of this technology can overcome expensive chiral reagent and the influence that complicated synthesis step brings, and more and more receive the attention of scientists.
Chiral polymer is because it in applications well prospects that the field showed such as chiral recognition, photic polarizing fluorescence, chiral catalysis and liquid crystal materials, more and more receives people's common concern.The compound method of chiral polymer mainly contains the polymerization of chiral monomer, the methods such as chirality modification, chiral template control and the self-assembly of chirality supramolecule of achirality polymkeric substance at present.Mostly use expensive chiral reagent in these methods, the kind of synthetic chiral polymer is also very limited simultaneously, has greatly retrained the development of chiral polymer.Left-handed/right-circularly polarized light is used for the synthetic of chiral polymer as chiral source taught seminar's reported first in 1997 by Nikolova, and then this technology has caused numerous scientists' attention.Be applicable to that above-mentioned technology mainly is the side chain type azobenzene polymer, and all be the chiral induction phenomenon that under filminess, takes place.The mechanism that the type azobenzene polymer chirality produces generally believes it is that azobenzene group carries out supramolecular ordered gathering (moment of momentum of left-handed/right-handed polarized light is transferred to azobenzene group and caused) at side chain under the inducing of left-handed/right-circularly polarized light; What embody is supermolecule chirality, rather than the chirality of single azo-benzene units.At present; The synthetic backbone chain type azobenzene polymer film of left-handed/right-hand circular polarization photoinduction has only a kind of of Japanese H. professor Takezoe report; Induce the chirality of generation to come from the polymkeric substance the chromophoric chirality of single nitrogen benzide on the backbone structure, promptly polymkeric substance axially carries out the result of photic assembling.
The contriver thinks that left-handed/right-circularly polarized light induces the synthesis of chiral polymkeric substance more simple and convenient and cheap as chiral source.As long as line polarized light can be produced circularly polarized light through behind the polarizer; Adjusting through the polarizing angle degree can obtain left-handed/right-circularly polarized light again, and unique loss is exactly the consumptive material of light source (high voltage mercury lamp can continue to use more than 800 hours), the polarizer and spectral filter and so on.But this technology is used in the solution dispersion system, synthesizing azobenzene chiral polymer nanoparticle report is not also arranged so far.
Summary of the invention
The object of the invention provides a kind of method for preparing photoresponse chirality intelligent nano particle, to overcome that the chiral reagent that exists in traditional chiral polymer building-up process costs an arm and a leg and a difficult problem such as synthesis step complicacy.
For reaching the foregoing invention purpose; The present invention is left-handed through using/and right-circularly polarized light induces synthesis of chiral intelligent nano particle as chiral source under the solution dispersion system; The moment of momentum of circularly polarized light is transferred to the azobenzene group in the polymer architecture through irradiation, thereby makes polymer nano-particle have chirality.
The concrete technical scheme that the present invention adopts is:
A kind of preparation method of photoresponse type chirality intelligent nano particle, with 9, it is 1 * 10 that 9-dioctyl fluorene-nitrogen benzide alternating copolymer is made into
-3～1 * 10
-1The chloroform soln of mg/mL, said 9,9-dioctyl fluorene-nitrogen benzide alternating copolymer
M n=7770 g/mol,
M w/
M n=2.62, the alcohol of getting above-mentioned solution and equal volume mixes, and with left-handed or dextropolarization photoirradiation 1～30 minute, obtains the chirality nanoparticle of left-handed or right hand property.
Optimized technical scheme, said 9, the chloroform soln concentration of 9-dioctyl fluorene-nitrogen benzide alternating copolymer is 3 * 10
-2Mg/mL.
In the technique scheme, 9,9-dioctyl fluorene-nitrogen benzide alternating copolymer be poly [(9,9-di-
n-octylfluorenyl-2,7-diyl)-
Alt-4,4 '-azobenzene], F8AZO.Above-mentioned polymers soln is used a left side/right-circularly polarized light alternately irradiated respectively, and this nanoparticle shows comparatively excellent chirality intelligent response property, repeatedly conversion repeatedly between property and the right hand property leftward.
In the technique scheme, 9,9-dioctyl fluorene-nitrogen benzide alternating copolymer is by 2, and 7-two (4; 4,5,5-tetramethyl--1,3; 2-dioxa penta boron ring-2-yl)-9,9-di-n-octyl fluorenes and 4,4-dibromo nitrogen benzide adopt Suzuki (Suzuki) condensation reaction to be prepared from.
Wherein, obtain 4 in that Manganse Dioxide is synthetic under as the condition of catalyzer, 4-dibromo nitrogen benzide (can referring to Journal of Polymer Science:Part A:Polymer Chemistry, 2000,38,1057 – 1063) by para-bromoaniline.
Particularly, Manganse Dioxide is dissolved in the benzole soln that has dewatered, stirs and add para-bromoaniline after 0.5 hour; 24 hours continued back flow reaction of stirring at room are 12 hours under argon atmosphere; Suction filtration revolves filtrating that to do the back pure 4 with obtaining behind the absolute ethyl alcohol recrystallization, 4-dibromo nitrogen benzide.
With 2,7-two (4,4,5; 5-tetramethyl--1,3,2-dioxa penta boron ring-2-yl)-9; 9-di-n-octyl fluorenes, 4,4-dibromo nitrogen benzide, tetrakis triphenylphosphine palladium and salt of wormwood were with 100: 100: 1: 3: 500 molar ratio, THF and water are pressed 1.5: 1 volume ratio, THF and 4; 4-dibromo nitrogen benzide constitutes polymerization system by 3 mmol/15 mL, and polymerization system 80 ℃ of reactions 72 hours, is poured methanol extraction into after the finishing polymerization after deoxygenation; With acetone extracting 72 hours, obtain 9,9-dioctyl fluorene-nitrogen benzide alternating copolymer behind the suction filtration.
In the technique scheme, it is light source that the left-handed or right-hand circular polarization of institute only adopts the 500W high voltage mercury lamp, obtains through the polarizer, spectral filter and 1/4 wavelength plate.
Optimized technical scheme, described alcohol are methyl alcohol and isopropylcarbinol (alcohol of all the other different structures all has similar behavior), and in mixed system, trichloromethane is a good solvent, and methyl alcohol or isopropylcarbinol are Weak solvent.
The chirality of formed nanoparticle derives from left-handed/right-circularly polarized light in mixed solvent, and the hand of spiral of chirality can be regulated through the sense of rotation of polarized light.
The chirality of polymer nano-particle mainly characterizes through circular dichroism spectrum spectrum, and the size of nanoparticle characterizes through dynamic light scattering, and the size of the nanoparticle that technique scheme obtains is about 400-500 nm.
Because the technique scheme utilization, the present invention compared with prior art has advantage:
1. be the backbone chain type azobenzene polymer owing to what the present invention adopted, enlarged the scope of left-handed/right-hand circular polarization photoinduction synthesis of chiral polymkeric substance.
2. what the present invention adopted is the solution dispersion system, different with the filminess of conventional chiral polymer, and a kind of chiral polymer nanoparticle of solution dispersion state is provided.
3. the present invention adopts left-handed/right-circularly polarized light inductive technology, conveniently is easy to get, and is cheap, and the light source long service life has overcome traditional method synthetic polymer chirality nanoparticle chiral reagent and cost an arm and a leg and problem such as synthesis step complicacy.
4. the present invention utilizes the alternately irradiation of left-handed/right-circularly polarized light under the solution dispersion state, can change the chirality direction of nanoparticle, demonstrates excellent photoswitch performance.
Description of drawings
Fig. 1 is the light source synoptic diagram in the embodiment of the invention one and routine two.
Fig. 2 be embodiment one with example two in the structural representation of the polymkeric substance F8AZO that obtains.
Fig. 3 be embodiment one with example two in the nucleus magnetic hydrogen spectrum figure of the polymkeric substance F8AZO that obtains.
Fig. 4 be embodiment one with example two in the nuclear-magnetism carbon spectrogram of the polymkeric substance F8AZO that obtains.
Fig. 5 is the size distribution figure of polymkeric substance F8AZO behind mixed solvent (trichloromethane/methyl alcohol) back warp circularly polarized light pre-irradiation among the embodiment one.
Fig. 6 be among the embodiment one polymkeric substance F8AZO solution (trichloromethane/methyl alcohol) through different wave length left-handed/circular dichroism spectrum and ultraviolet-visible light spectrogram before and after the right-hand circular polarization photoirradiation 30 minutes.
Fig. 7 is the circular dichroism spectrum and the ultraviolet-visible light spectrogram of left-handed/right-hand circular polarization photoirradiation different time of polymkeric substance F8AZO solution (trichloromethane/methyl alcohol) warp 436 nm among the embodiment one.
Fig. 8 is the chirality photoswitch response synoptic diagram of polymkeric substance F8AZO solution (trichloromethane/methyl alcohol) among the embodiment one.
Fig. 9 is circular dichroism spectrum and the ultraviolet-visible light spectrogram of polymkeric substance F8AZO solution (trichloromethane/isopropylcarbinol) before and after the left-handed/right-hand circular polarization photoirradiation 30 minutes of different wave length among the embodiment two.
Figure 10 is the chirality photoswitch response synoptic diagram of polymkeric substance F8AZO solution (trichloromethane/isopropylcarbinol) among the embodiment two.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Embodiment one: referring to shown in Figure 1, be the left-handed/right-hand circular polarization radiant synoptic diagram of present embodiment employing.In the present embodiment, adopt 500 watts of high voltage mercury lamps of the Japanese Ushio USH-500SC2 of company type, spike filter (405,436 and 546 nm, Sigma Koki and Asahi spectra company), the polarizer (230 –, 2300 nm, Sigma Koki); 1/4 wavelength version (Sigma Koki).
Used chemical reagent among the embodiment: tetrakis triphenylphosphine palladium, 99%, Aldrich; Para-bromoaniline, 99%, Aldrich; Manganse Dioxide, 98%, Acros; Benzene, 99%, Aldrich; THF, 99%, Acros; 2, two (4,4,5,5-tetramethyl--1,3,2-dioxa penta boron ring-2-yl)-9 of 7-, 9-di-n-octyl fluorenes, 98%, Aldrich; Acetone, 99%, China Medicine (Group) Shanghai Chemical Reagent Co.; Salt of wormwood, 99%, China Medicine (Group) Shanghai Chemical Reagent Co.; Trichloromethane, 99%, China Medicine (Group) Shanghai Chemical Reagent Co.; Absolute ethyl alcohol and isopropylcarbinol, 99%, China Medicine (Group) Shanghai Chemical Reagent Co..
Testing tool and condition:
Circular dichroism spectrograph: the Japanese JASCO JASCO-725 of company type; Condition determination: sweep velocity 100 nm/min, wavelength region: 165～900 nm; Wavelength accuracy: ± 0.1 nm (165～900 nm); Bandwidth 1 nm; 1 second time of response; 25 ℃ of probe temperatures.Uv absorption spectrum obtains under above-mentioned identical test condition.
Dynamic laser light scattering apparatus: the Japanese Otsuka DLS-6000 of company type; 25 ℃ of probe temperatures.
The preparation of one, photoresponse type chirality intelligent nano particle comprises the following steps:
(1) preparation monomer 4,4-dibromo nitrogen benzide.
20 g Manganse Dioxide are dissolved in the 250 mL benzole solns that dewatered; Stir the para-bromoaniline that adds 10 g after 0.5 hour; 24 hours continued back flow reaction of stirring at room are 12 hours under argon atmosphere; Suction filtration revolves filtrating that to do the back pure 4 with obtaining behind the absolute ethyl alcohol recrystallization, 4-dibromo nitrogen benzide 8 g.
(2) preparation 9,9-dioctyl fluorene-nitrogen benzide alternating copolymer (F8AZO).
2,7-two (4,4; 5,5-tetramethyl--1,3; 2-dioxa penta boron ring-2-yl)-9,9-di-n-octyl fluorenes, 4,4-dibromo nitrogen benzide, tetrakis triphenylphosphine palladium and salt of wormwood were with 100: 100: 1: 3: 500 molar ratio; THF and water were by 1.5: 1 volume ratio, THF and 4, and 4-dibromo nitrogen benzide constitutes polymerization system by 3 mmol/15 mL, and wherein 4; The feeding quantity of 4-dibromo nitrogen benzide is 1.04 g (3.06 mmol), and polymerization system reacted 72 hours at 80 ℃ after the freezing deoxygenation of bleeding.Pour methyl alcohol after the finishing polymerization into and precipitate, obtain product 1.50 g with acetone extracting purification after 72 hours behind the suction filtration, the molecular weight of polymkeric substance and molecular weight distributing index are respectively 7770 g/mol and 2.62.
(3) preparation of chirality intelligent nano particle.
It is 3 * 10 that polymkeric substance F8AZO is made into solubility
-2The chloroform soln of mg/mL is got the above-mentioned solution of 1.5 mL and is positioned in the cuvette.Methyl alcohol with 1.5 mL joins in the chloroform soln of above-mentioned polymkeric substance then, rocks evenly.Above-mentioned polymers soln was placed under left-handed/right-circularly polarized light irradiation 30 minutes.The chirality of polymer nano-particle mainly characterizes through circular dichroism spectrum spectrum, and the size of nanoparticle characterizes through dynamic light scattering.
Two, the affirmation of product:
Accompanying drawing 3 and 4 be respectively embodiment one with example two in the nucleus magnetic hydrogen spectrum (Fig. 3) of the polymkeric substance F8AZO that obtains compose (Fig. 4) spectrogram with carbon.From Fig. 3, can very clearly find out to be the chemical shift of corresponding hydrogen on fluorenes and the azo-benzene units in the polymer architecture in the characteristic peak correspondence of 7.50-8.25 ppm; The characteristic peak at 2.10 ppm places corresponding be the chemical shift of two nearest methylene radical of connecting on the fluorenes unit in the polymer architecture, the methylene radical on all the other alkyl chains and the chemical shift of methyl appear at 0.5-1.40 ppm place.On the carbon spectrum of Fig. 4 polymkeric substance, can clearly find out the chemical shift peak that constitutional unit is corresponding, 120.43,121.63,123.65; 124.48,126.39,127.89,132.44; 139.30 140.69,144.18,151.95 and 152.06 ppm places are corresponding is the chemical shift of the carbon atom of correspondence on fluorenes and the azo-benzene units in the polymer architecture; 14.27,22.66,22.70,29.28; 30.09,31.83,40.58 with 55.55 ppm places corresponding be the chemical shift of the carbon atom on the alkyl chain that links to each other with the fluorenes unit in the polymer architecture.The result that the attached gel chromatogram records has fully proved the structure of synthetic polymkeric substance among Fig. 2.
Three, the sign of chirality intelligent nano particle:
(1) can find out that from the grain size figure of Fig. 5 polymkeric substance F8AZO behind the left circularly polarized light pre-irradiation of trichloromethane/methanol mixed solvent back warp 436 nm the size of pre-irradiation post polymerization thing particle is between 400-500 nm;
(2) can find out from the circular dichroism spectrum spectrogram of Fig. 6 polymkeric substance F8AZO behind left-handed/right-circularly polarized light pre-irradiation of 436 nm and 546 nm; The chirality signal that the pre-irradiation polymers soln has no; And has tangible chirality signal behind the irradiation; The chiral helical direction of polymer nano-particle can be controlled through the hand of spiral of light simultaneously, and the circular polarization light wavelength is to the almost not influence of power of chirality signal under this system.From Fig. 6 polymkeric substance F8AZO at trichloromethane/methanol mixed solvent back warp Left-hand circular polarization photoirradiation after 30 minutes; The chirality of polymer nano-particle (is standard with the peak value about 500 nm) presents tangible negative value; And again behind the right-hand circular polarization photoirradiation different time of 436 nm; The chirality of polymer nano-particle (is standard with the peak value about 500 nm) take place significantly upset (referring to Fig. 7, promptly from original negative value gradually become on the occasion of); Fig. 8 is the chirality photoswitch synoptic diagram of polymkeric substance F8AZO in trichloromethane/methanol mixed solvent; As can be seen from the figure; The chirality of polymer nano-particle is behind dextrorotation/left circularly polarized light alternately irradiated of 436 nm; Peak value about 500 nm just appearing/alternate of negative value, have the performance of chirality photoswitch preferably.Above result shows that can successfully the chirality of circularly polarized light successfully be transferred on the polymer nano-particle through this method, this chirality nanoparticle has chirality photoswitch performance preferably.
Four, the application of chirality intelligent nano particle:
Chirality intelligent nano particle has purposes comparatively widely in many aspects: (1) chirality photoswitch (an existing sufficient digital proof (Fig. 8) in this instance); (2) chiral separation; This chirality nanoparticle can have huge potential application in the chiral separation field of medicine; And the irradiation of polarized light that can be through the different hands of spiral in the split process is realized the upset of this nanoparticle chirality, and then realizes the reverse fractionation of chiral drug.
Embodiment two: change the Weak solvent among the embodiment one into isopropylcarbinol, can prepare polymkeric substance chirality intelligent nano particle equally, specifically describe as follows:
(1) can find out through the circular dichroism spectrum spectrogram of Fig. 9 polymkeric substance F8AZO behind left-handed/right-circularly polarized light pre-irradiation of 436 nm and 546 nm; The chirality signal that the pre-irradiation polymers soln has no; And has tangible chirality signal behind the irradiation; The chiral helical direction of polymer nano-particle can be controlled through the hand of spiral of light simultaneously, and the circular polarization light wavelength has certain influence to the power of the chirality signal of polymer nano-particle, and this is different in embodiment one;
(2) Figure 10 is the chirality photoswitch synoptic diagram of polymkeric substance F8AZO in trichloromethane/methanol mixed solvent; As can be seen from the figure; The chirality of polymer nano-particle is behind dextrorotation/left circularly polarized light alternately irradiated of 436 nm; Peak value about 500 nm just appearing/alternate of negative value, have the performance of chirality photoswitch preferably.Above result shows that can successfully the chirality of circularly polarized light successfully be transferred on the polymer nano-particle through this method, this chirality nanoparticle has chirality photoswitch performance preferably.
Claims (6)
1. the preparation method of a photoresponse type chirality intelligent nano particle, it is characterized in that: with 9, it is 1 * 10 that 9-dioctyl fluorene-nitrogen benzide alternating copolymer is made into
-3～1 * 10
-1The chloroform soln of mg/mL, said 9,9-dioctyl fluorene-nitrogen benzide alternating copolymer
M n=7770 g/mol,
M w/
M n=2.62, the alcohol of getting above-mentioned solution and equal volume mixes, and with left-handed or dextropolarization photoirradiation 1～30 minute, obtains the chirality nanoparticle of left-handed or right hand property.
2. the preparation method of photoresponse type chirality intelligent nano particle according to claim 1 is characterized in that: said 9, the chloroform soln concentration of 9-dioctyl fluorene-nitrogen benzide alternating copolymer is 3 * 10
-2Mg/mL.
3. the preparation method of photoresponse type chirality intelligent nano particle according to claim 1 is characterized in that: 9, and 9-dioctyl fluorene-nitrogen benzide alternating copolymer is by 2; 7-two (4,4,5; 5-tetramethyl--1,3,2-dioxa penta boron ring-2-yl)-9; 9-di-n-octyl fluorenes and 4,4-dibromo nitrogen benzide adopt the Suzuki condensation reaction to be prepared from.
4. the preparation method of photoresponse type chirality intelligent nano particle according to claim 3 is characterized in that: obtain 4,4-dibromo nitrogen benzide by para-bromoaniline in that Manganse Dioxide is synthetic under as the condition of catalyzer.
5. the preparation method of photoresponse type chirality intelligent nano particle according to claim 1 is characterized in that: it is light source that the left-handed or right-hand circular polarization of institute only adopts the 500W high voltage mercury lamp, obtains through the polarizer, spectral filter and 1/4 wavelength plate.
6. the preparation method of photoresponse type chirality intelligent nano particle according to claim 1; It is characterized in that: described alcohol is methyl alcohol, ethanol, n-propyl alcohol, propyl carbinol, Pentyl alcohol, Virahol or isopropylcarbinol; In mixed system, trichloromethane is a good solvent, and alcohol is Weak solvent.
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| CN103087296B (en) * | 2013-01-29 | 2015-07-29 | 复旦大学 | A kind of linear azobenzene liquid liquid crystal high polymer material and preparation method thereof |
| CN104059091A (en) * | 2014-06-24 | 2014-09-24 | 福州大学 | Photoinduction enantioselective synthetic method of copper based chiral coordination polymer |
| CN104059091B (en) * | 2014-06-24 | 2016-01-06 | 福州大学 | A kind of method of photoinduction enantioselective synthesis of copper base chirality ligand polymer |
| CN105295007A (en) * | 2015-10-30 | 2016-02-03 | 南京邮电大学 | Conjugate water-soluble polymer tracer material and preparation method thereof |
| CN108467448A (en) * | 2018-03-12 | 2018-08-31 | 中国科学技术大学 | A kind of method that mating surface plasma resonance enhancing technology realizes double acetylene compound enantioselectivity amplification polymerizations |
| CN108440959A (en) * | 2018-04-10 | 2018-08-24 | 南通纺织丝绸产业技术研究院 | Chiral backbone type azobenzene polymer aggregation and preparation method thereof |
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Inventor after: Zhang Wei Inventor after: Zhang Jian Inventor after: Liu Jiangfei Inventor after: Zhu Xiulin Inventor after: Zhou Nianchen Inventor before: Zhang Wei Inventor before: Zhang Jian Inventor before: Liu Jiangfei Inventor before: Zhu Xiulin Inventor before: Zhou Nianchen |
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