CN113896865A - Naphthalimide polymer semiconductor containing dopamine-derived side chain and preparation method thereof - Google Patents

Naphthalimide polymer semiconductor containing dopamine-derived side chain and preparation method thereof Download PDF

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CN113896865A
CN113896865A CN202111229497.0A CN202111229497A CN113896865A CN 113896865 A CN113896865 A CN 113896865A CN 202111229497 A CN202111229497 A CN 202111229497A CN 113896865 A CN113896865 A CN 113896865A
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naphthalimide
dopamine
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邓平
朱笔李
肖余发
李俊
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Fuzhou University
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Abstract

The invention relates to a naphthalimide polymer semiconductor containing dopamine-derived side chains and a preparation method thereof. The naphthalimide polymer containing the dopamine-derived side chain has wide and strong absorption in a visible-near infrared region, is probably due to the increase of the content of the dopamine-derived side chain, improves the solid accumulation effect of polymer molecules, explores new derived side chains, is applied to the design of a novel naphthalimide construction unit, and has positive research significance. The side chain regulates and controls the polymer through the introduced dopamine derivative structural unit, and the flexible side chain can provide good solubility for the material and can be dissolved in solvents such as chloroform, chlorobenzene, toluene and the like, so that the material can be processed by a solution. Therefore, the invention has potential application prospect in organic solar cell devices as a donor material of a semiconductor active layer.

Description

Naphthalimide polymer semiconductor containing dopamine-derived side chain and preparation method thereof
Technical Field
The invention relates to a naphthalimide polymer semiconductor containing dopamine-derived side chains and a preparation method thereof, belonging to the field of organic solar cell materials.
Background
Solar cells are produced within one hundred years after the discovery of photovoltaic effect, so that silicon-based solar cells have entered many fields by virtue of over 20% of industrial photoelectric conversion efficiency, but inorganic silicon solar cells have the disadvantages of high production cost and ecological pollution which cannot be avoided in production. Compared with the organic solar cell, the organic solar cell has many advantages, the organic material has various types, and the structure can be regulated and controlled to optimize the properties of the organic solar cell, such as light absorption capacity, electrochemical energy level, carrier transmission capacity and the like, so that the photovoltaic performance is further optimized. Organic semiconductor materials, particularly polymeric semiconductor materials, can be used in Roll-to-Roll (Roll to Roll) printing of large area devices and in the fabrication of flexible devices.
Naphthalene Diimide (NDI) is an important building block for the construction of polymeric acceptor materials. Among them, the polymer N2200 which is most widely studied and has the best performance is used. N2200 is a high-performance N-type polymer semiconductor material, and has the characteristics of better compatibility, optical absorption complementarity, electrochemical energy level matching property and the like with some high-performance polymer donor materials. Methods for regulating the photoelectric property of the organic semiconductor material are numerous, and one of the methods is to regulate the photoelectric property of the receptor material through molecular side chain engineering. Dopamine, the best known small molecule of hundreds of neurotransmitters in the human brain, binds to dopamine receptors and operates many nerve channels in brain regions, constituting the brain's reward system. Dopamine has found applications in polymer systems because of its unique adhesion, hydrophilicity, biocompatibility, and good film-forming properties in water. In addition, the bisphenol group of dopamine is easy to introduce an auxiliary solubility alkyl chain to form a heterolytic side chain unit, thereby providing good solubility for a polymer material.
Disclosure of Invention
The invention aims to provide a naphthalimide polymer containing a dopamine-derived side chain and a preparation method thereof for the photoelectric conversion efficiency of an organic solar cell. The conjugated polymer has the advantages of simple preparation process, excellent photoelectric property, solution processing and the like, and has great application potential in the field of organic solar cell receptor materials.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the present invention relates to a naphthalimide polymer semiconductor containing dopamine-derived side chains and a preparation method thereof, wherein the conjugated polymer has a structural formula as follows:
Figure BDA0003315486050000021
wherein R is1And R2Is C1-C30 alkyl chain, and n is more than or equal to 1.
In a second aspect, the present invention relates to a naphthalimide polymer semiconductor containing dopamine-derived side chains and a method for preparing the same, comprising the steps of:
(1) dissolving a monomer M1, a monomer M2, a methyl tin monomer M3, a catalyst and a ligand in an anhydrous organic solvent according to the molar parts; heating and polymerizing under argon atmosphere, purifying by Soxhlet extraction, and vacuum drying to obtain the dark purple naphthalimide polymer containing dopamine-derived side chains.
Preferably, in step (a), the monomer M1 has the following structural formula:
Figure BDA0003315486050000031
preferably, in step (a), the monomer M2 has the following structural formula:
Figure BDA0003315486050000032
preferably, in step (a), the monomer M3 has the following structural formula:
Figure BDA0003315486050000033
preferably, in step (a), the molar ratio of the monomer M1, the monomer M2 and the monomer M3 is 0.3: 0.7: 1.
preferably, in step (a), the anhydrous organic solvent is anhydrous toluene, anhydrous chlorobenzene or tetrahydrofuran.
Preferably, in step (a), the catalyst is tris (dibenzylideneacetone) dipalladium and the ligand is tris (o-methylphenyl) phosphorus.
Preferably, in the step (a), the heating is specifically: reacting for 48 hours at 100 ℃; the solvents adopted in sequence in the Soxhlet extraction are methanol, petroleum ether and chloroform.
(2) The monomer M1 in step (1) is prepared by the following steps:
a. adding 1 part of tert-butyl 3, 4-dihydroxyphenethylcarbamate, 2.4 parts of brominated hydrocarbon and 2.1 parts of potassium carbonate into an organic solvent according to molar parts, and reacting at 80 ℃ for 12 hours; after the reaction is finished, an intermediate compound A is obtained after extraction and drying, and the structural formula of the intermediate compound A is as follows:
Figure BDA0003315486050000041
b. adding 1 part of intermediate compound A into an organic solvent according to molar weight parts, and reacting for 4 hours at room temperature; after the reaction is finished, purifying and drying the intermediate compound B by a silica gel column to obtain an intermediate compound B, wherein the structural formula of the intermediate compound B is as follows:
Figure BDA0003315486050000042
c. adding 1 part of 2, 6-dibromonaphthalene-1, 4,5, 8-tetracarboxylic dianhydride (CAS:83204-68-6) and 2.5 parts of intermediate compound B into an organic solvent according to molar parts, and reacting at 120 ℃ for 12 hours; after the reaction is finished, the monomer M1 is obtained after silica gel column extraction and drying.
Preferably, in step a, the organic solvent is N, N-dimethylformamide, and the brominated hydrocarbon is a C1-C30 brominated alkane.
Preferably, in step b, the organic solvent is a mixed solvent of dichloromethane and trifluoroacetic acid.
Preferably, in step c, the organic solvent is acetic acid.
The invention has the following remarkable advantages:
(1) the naphthalimide n-type polymer containing dopamine derived side chains synthesized by the invention adopts classical Stille coupling polycondensation to synthesize a series of polymers with ultrahigh number average molecular weight.
(2) The raw materials used in the invention are all easily available and low in price, and the synthesis process is simple and mature, and overall, the synthesis cost is low.
(3) The main chain of the conjugated polymer prepared by the invention has a large pi conjugated structure of a rigid plane, and the introduction of the dopamine side chain forms a heterosis side chain unit, so that good solubility is provided for a polymer material, and the polymer material has the potential of being used as an organic field solar cell device.
(4) The polymer of the invention has a large light absorption range and good chemical stability and thermal stability.
Drawings
FIG. 1 is a scheme showing the synthesis of polymer P in example 1 of the present invention.
FIG. 2 shows the NMR spectrum of monomer M1 in example 1 of the present invention.
FIG. 3 shows the NMR carbon spectrum of monomer M1 in example 1 of the present invention.
FIG. 4 shows the NMR spectrum of a polymer P in example 1 of the present invention.
FIG. 5 shows a film UV-Vis spectrum of the polymer P in example 2 according to the invention.
FIG. 6 is a CV curve of polymer P in example 2 of the present invention.
FIG. 7 is a thermogravimetric plot of polymer P in example 2 of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1 preparation of a Naphthylimide Polymer semiconductor containing dopamine-derived side chains
This example provides 1 kind of naphthalimide polymer containing dopamine derivative side chain, whose structural formula is shown in the following figure, and its synthetic route is shown in fig. 1.
Figure BDA0003315486050000061
Wherein R is1And R2Is C1-C30 alkyl chain, and n is more than or equal to 1.
1.1 preparation of monomer M1
The preparation of the monomer M1 specifically comprises the following steps:
(a) synthesis of intermediate Compound A
The structural formula of the intermediate compound A is
Figure BDA0003315486050000062
R2=-C10H21
Under an argon atmosphere, tert-butyl 3, 4-dihydroxybenzene ethylcarbamate (14.84mmol), decyl bromide (35.62mmol), potassium carbonate (31.17mmol) and N, N-dimethylformamide (20mL) were added to a two-necked flask. After the reaction mixture was stirred at 80 ℃ for 12 hours, it was cooled to room temperature, extracted with ethyl acetate, and the resulting organic phase was washed successively with water and saturated brine, dried over anhydrous magnesium sulfate, filtered, and the solvent was removed under reduced pressure. Methanol was added and the resulting precipitate was collected by filtration and dried under vacuum to give intermediate compound a as a white solid (yield 30%).1H NMR(600MHz,CDCl3):δ6.81(d,J=8.0Hz,1H),6.72–6.67(m,2H),4.52(s,1H),3.96(td,J=6.7,4.2Hz,4H),3.34(d,J=6.3Hz,2H),2.71(t,J=6.8Hz,2H),1.84–1.75(m,4H),1.51–1.38(m,12H),1.40–1.09(m,28H),0.91–0.86(m,6H).
Among these references for the synthesis of tert-butyl 3, 4-dihydroxyphenethylcarbamate: maerten C, Garnier T, Lupatelli P, et al, Morphogen electrochemical sampled Self-Construction of Polymeric Films Based on Mussel-induced Chemistry [ J ]. Langmuir the Acs Journal of surfaces & Colloids 2015: 13385.
(b) Synthesis of intermediate Compound B
The structural formula of the intermediate compound B is
Figure BDA0003315486050000071
R2=-C10H21
Under an argon atmosphere, intermediate compound a (4.8mmol) and a mixture of compounds represented by volume ratio 6: a mixture of dichloromethane and trifluoroacetic acid (7mL) in a 1 ratio configuration was added to the two-necked flask. The reaction mixture was reacted at room temperature for 4 hours, the reaction mixture was quenched with 20mL of a 5% aqueous solution of sodium hydroxide, extracted with dichloromethane, and the resulting organic phase was washed successively with water and saturated brine, dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. Purification through flash silica gel column (eluent petroleum ether: ethyl acetate 7:1 by volume) afforded intermediate compound B as a white solid after drying in vacuo (83% yield).1H NMR(600MHz,CDCl3):δ6.81(d,J=8.1Hz,1H),6.74–6.69(m,2H),3.97(dt,J=8.8,6.7Hz,4H),2.94(t,J=6.8Hz,2H),2.68(t,J=6.8Hz,2H),1.82–1.77(m,4H),1.49–1.43(m,4H),1.34–1.21(m,24H),0.90–0.86(m,6H).
(c) Synthesis of monomer M1
The monomer M1 has a structural formula
Figure BDA0003315486050000081
R2=-C10H21
Under an argon atmosphere, 2, 6-dibromonaphthalene-1, 4,5, 8-tetracarboxylic dianhydride (CAS:83204-68-6) (1.57mmol), intermediate compound B (3.94mmol), and anhydrous acetic acid (25ml) were added to a two-necked flask. Reacting at 120 deg.C for 12 hr, cooling the reactant to room temperature, adding100ml of cold water was added. The precipitate was collected by filtration and washed with methanol to give the crude product. Purification by column chromatography (eluent dichloromethane: petroleum ether 5:1 by volume) dissolved in dichloromethane, added the appropriate amount of petroleum ether, frozen (-18 ℃) and filtered gave monomer M1 as a white solid (10.1%).1H NMR(600MHz,CDCl3):δ9.00(s,2H),6.88(d,J=2.0Hz,2H),6.85(dd,J=8.1,2.0Hz,2H),6.81(d,J=8.1Hz,2H),4.42–4.37(m,4H),3.98(dt,J=18.9,6.7Hz,8H),2.98–2.94(m,4H),1.80(ddt,J=14.7,12.6,6.3Hz,8H),1.49–1.43(m,8H),1.39–1.23(m,48H),0.91–0.85(m,12H).13C NMR(101MHz,Chloroform-d)δ160.67,147.98,139.07,130.63,121.22,114.72,114.16,69.45,69.34,42.94,33.58,31.95,29.70,29.67,29.64,29.62,29.50,29.48,29.41,29.39,26.10,26.07,22.72,14.16.
1.2 Synthesis of Polymer P
The structural formula of the polymer P is
Figure BDA0003315486050000091
R2=-C10H21,n≥1。
The invention optimizes the reaction condition of the conjugated polymer for many times, firstly optimizes the solvent used for polymerization, and selects o-xylene, 2-methyltetrahydrofuran and the like as the solvent. In addition, the amount of catalyst is also optimized. The final optimization results were as follows:
under the argon atmosphere, adding monomer M1(0.06mmol), monomer M2(0.14mmol), monomer M3(0.2mmol) and anhydrous toluene (0.4mL) into a pressure-resistant tube, stirring and dissolving, adding tris (dibenzylideneacetone) dipalladium (0.002mmol) and tris (o-methylphenyl) phosphine (0.008mmol), deoxidizing on the liquid for 10min, and sealing the tube. Reacting at 100 ℃ for 48 hours, cooling the reactant to room temperature, adding methanol, and filtering under reduced pressure to obtain a crude product. The crude product was subjected to soxhlet extraction with methanol, petroleum ether and chloroform in this order, and chloroform-extracted fractions were collected, the solvent was removed under reduced pressure, methanol was added to obtain a precipitate, which was filtered and vacuum-dried to obtain the objective polymer P (99.8%).1H NMR(400MHz,Chloroform-d)δ8.83(s,1H),8.51(s,1H),7.34(s,4H),6.82(s,1.8H),4.38(s,1.2H),4.13(s,2.8H),3.96(s,2.4H),2.95(s,1.2H),1.25(s,64H),0.85(s,12H).Mn=127.6kDa,Mw=345.6kDa,PDI=2.70。
Wherein monomer M2 was purchased from Aladdin (CAS: 1100243-35-3); monomer M3 was purchased from Aladdin (CAS: 86134-26-1).
Example 2 ultraviolet absorption Spectroscopy, electrochemical Properties and thermal stability of Polymer P
2.1 ultraviolet absorption Spectrum of Polymer P
FIG. 5 shows the UV absorption spectra of polymer P in chlorobenzene solutions and films. Comparing the film absorption and solution absorption properties, it can be seen that the absorption peaks of both do not show significant broadening, which is associated with good molecular stacking of the material. The polymer film absorbs in the long wavelength absorption range of 450-850 nm, and has stronger absorption characteristic compared with solution absorption. The results show that the accumulation of molecules in each polymer film is stronger, and the charge transfer effect in the molecules is more obvious. The polymer P has high absorption strength in the visible light region and wide absorption peak, which is probably related to the introduction of the most dopamine-derived side chains. Initial absorption wavelength (λ onset) of polymer P filmfilm) At around 863nm, the Eg can be calculated from thisfilm=1.44eV(Egfilm=1240/λonsetfilmeV), indicating that the polymer is a narrow bandgap polymer.
2.2 electrochemical Properties of Polymer P
Ag/AgNO with platinum sheet as working electrode and platinum wire as counter electrode3The electrode was the reference electrode, 0.1M tetrabutylammonium hexafluorophosphate acetonitrile solution was the electrolyte, ferrocene was the calibration, the scan rate was 60mV/s, and the polymer was tested on a platinum sheet. Figure 6 shows the electrochemical curves of the polymers obtained from the tests. The energy level and the energy gap can be calculated according to the formula: eLUMO=﹣(Ere onset+4.33)eV,Eg=ELUMO-EHOMOIn which Ere onsetIs the initial reduction potential.
As can be seen from FIG. 6, E of Polymer Pre onsetIs-0.54 eV. According to a given formula, the calculation of the convergenceThe LUMO level of compound P was-3.79 eV. It can act as an acceptor material from the point of view of its energy level.
2.3 thermal stability of Polymer P
FIG. 7 shows that the thermal decomposition temperature of the polymer P is above 400 ℃ and shows that the polymer P has good thermal stability.
2.4 solubility of Polymer P
The polymer P has better solubility in solvents such as chloroform, chlorobenzene and the like at room temperature, and guarantees the treatment of soluble solution of the polymer P.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims (10)

1. A naphthalimide polymer containing dopamine-derived side chains, characterized in that the structural formula of the polymer is as follows:
Figure FDA0003315486040000011
wherein R is1And R2Is C1-C30 alkyl chain, and n is more than or equal to 1.
2. The method of preparing a naphthalimide polymer having dopamine-derived side chains according to claim 1, comprising the steps of:
dissolving a monomer M1, a monomer M2, a methyl tin monomer M3, a catalyst and a ligand in an anhydrous organic solvent; heating and polymerizing under argon atmosphere, purifying by Soxhlet extraction, and vacuum drying to obtain the dark purple naphthalimide polymer containing dopamine-derived side chains.
3. The method for preparing a naphthalimide polymer containing dopamine-derived side chains according to claim 2, wherein the monomer M1 has the following structural formula:
Figure FDA0003315486040000021
R2is an alkyl chain of C1-C30.
4. The preparation method of the naphthalimide polymer containing the dopamine-derived side chain according to claim 3, wherein the monomer M1 is prepared by the following steps:
a. adding 1 part of tert-butyl 3, 4-dihydroxyphenethylcarbamate, 2.4 parts of brominated hydrocarbon and 2.1 parts of potassium carbonate into an organic solvent according to molar parts, and reacting at 80 ℃ for 12 hours; after the reaction is finished, an intermediate compound A is obtained after extraction and drying, and the structural formula of the intermediate compound A is as follows:
Figure FDA0003315486040000022
R2is an alkyl chain of C1-C30.
b. Adding 1 part of intermediate compound A into an organic solvent according to molar weight parts, and reacting for 4 hours at room temperature; after the reaction is finished, purifying and drying the intermediate compound B by a silica gel column to obtain an intermediate compound B, wherein the structural formula of the intermediate compound B is as follows:
Figure FDA0003315486040000031
R2is an alkyl chain of C1-C30.
c. Adding 1 part of 2, 6-dibromonaphthalene-1, 4,5, 8-tetracarboxylic dianhydride and 2.5 parts of intermediate compound B into an organic solvent according to molar parts, and reacting at 120 ℃ for 12 hours; after the reaction is finished, the monomer M1 is obtained after silica gel column extraction and drying.
5. The method for preparing the dopamine-derived pendant-containing naphthalimide polymer of claim 4, wherein the organic solvent of step a is N, N-dimethylformamide, and the brominated hydrocarbon is a C1-C30 brominated alkane; the organic solvent in the step b is a mixed solvent of dichloromethane and trifluoroacetic acid; the organic solvent in the step c is acetic acid.
6. The method for preparing a naphthalimide polymer containing dopamine-derived side chains according to claim 2, wherein the monomer M2 has the following structural formula:
Figure FDA0003315486040000032
R1is an alkyl chain of C1-C30.
7. The method for preparing a naphthalimide polymer containing dopamine-derived side chains according to claim 2, wherein the monomer M3 has the following structural formula:
Figure FDA0003315486040000033
8. the method of claim 2, wherein the catalyst is tris (dibenzylideneacetone) dipalladium and the ligand is tris (o-methylphenyl) phosphorus; the anhydrous organic solvent is anhydrous toluene, anhydrous chlorobenzene or tetrahydrofuran; the molar ratio of the monomer M1 to the monomer M2 to the monomer M3 is 0.3: 0.7: 1.
9. the method for preparing a naphthalimide polymer containing dopamine-derived side chains according to claim 2, wherein the heating is specifically: reacting for 48 hours at 100 ℃; the solvents adopted in sequence in the Soxhlet extraction are methanol, petroleum ether and chloroform.
10. The application of the naphthalimide polymer semiconductor containing the dopamine-derived side chain according to claim 1, wherein the naphthalimide polymer containing the dopamine-derived side chain is applied as a donor material of a semiconductor active layer in an organic solar cell device.
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