Copolymer containing dithiophenepyrrole-benzobis(benzothiadiazole), preparation method thereof and applications thereof
A technology of benzothiadiazole and dithiophene pyrrole, which is applied in the field of organic semiconductor materials, can solve problems such as limiting the application range, and achieve the effects of expanding the absorption range, improving stability, improving solubility and molecular weight
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[0033] The present invention also provides a preparation method for the above-mentioned copolymer containing dithiophene pyrrole-benzobis(benzothiadiazole), comprising the steps of:
[0034] S1, the preparation structural formula is Compound A (i.e. 5-nitro-2,1,3-benzothiadiazole):
[0035] 1. The structural formula is Compound I (4-nitrobenzene-1,2-diamine) was added to thionyl chloride, stirred and added to thionyl chloride (structural formula is ) was added dropwise pyridine (the structural formula is Molecular formula is C 5 h 5 N,), reflux reaction at 85 ° C, stop the reaction, the obtained structural formula is Compound F (that is, 5-nitro-2,1,3 benzothiadiazole); the reaction formula is as follows:
[0036]
[0037] Compound F is preferably purified by:
[0038] Heating the reaction solution to 80°C and rotary evaporating excess SOCl 2 Afterwards, the reaction product was cooled to room temperature, poured into a large amount of water, stirred, filtered,...
Embodiment 1
[0066] The copolymer containing dithiophene pyrrole-benzobis(benzothiadiazole) in this example, that is, poly{N-octyl-dithieno[3,2-b:2',3'-b'] Pyrrole-6,7-bis(3,7-dimethyl)octyl-benzo[2,1-e:3,4-e]bis(benzothiadiazole)}, its structural formula is as follows:
[0067]
[0068] The preparation process is as follows:
[0069] 1. Preparation of 4,4'-dibromo-6,6'-diiodo-bi-2,1,3-benzothiadiazole
[0070] 1. Preparation of compound 5-nitro-2,1,3 benzothiadiazole
[0071]
[0072] Add 4-nitrobenzene-1,2-diamine (22.95g, 0.15mol) and 100ml of thionyl chloride into a three-necked flask, stir and slowly add 2ml of pyridine dropwise, heat and reflux at 85°C for 24h, stop Reaction, heated to 80 °C and rotary evaporated excess SOCl 2 Finally, the reaction product was cooled to room temperature, poured into a large amount of water, stirred, filtered, washed with water and then dried in vacuum to obtain 21.7 g of the purified product 5-nitro-2,1,3-benzothiadiazole with a yield of 80%...
Embodiment 2
[0091] The copolymer containing dithiophenepyrrole-benzobis(benzothiadiazole) in this example, that is, poly{N-decyl-dithieno[3,2-b:2',3'-b'] Pyrrole-6,7-bis(3,7-dimethyl)octyl-benzo[2,1-e:3,4-e]bis(benzothiadiazole)}, its structural formula is as follows:
[0092]
[0093] The preparation process is as follows:
[0094] 1. Preparation of 4,4'-dibromo-6,6'-diiodo-bi-2,1,3 benzothiadiazole This step 1 is the same as step 1 in Example 1.
[0095] Two, 4,9-dibromo-6,7-bis(3,7-dimethyl)octyl-benzo[2,1-e:3,4-e]bis(benzothiadiazole) preparation
[0096] This step two is the same as step two of embodiment 1.
[0097] 3. Preparation of N-decyl-2,6-di(tributyltin)-dithieno[3,2-b:2',3'-b']pyrrole
[0098]
[0099] Under the protection of nitrogen, N-decyl-2,6-dibromo-dithieno[3,2-b:2',3'-b']pyrrole (7.16g, 0.015mol ), add 100ml of tetrahydrofuran solvent, slowly inject n-butyllithium (12.6mL, 2.5M, 0.03mol) with a syringe at -78°C, continue stirring for 2h, inject three Buty...
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