Copolymer containing cyclopentadiene bithiophene-benzobis(benzothiadiazole), preparation method and applications thereof
A benzothiadiazole and copolymer technology, which is applied in the fields of semiconductor/solid-state device manufacturing, organic chemistry, electric solid-state devices, etc., can solve the problem of low energy conversion efficiency, wide energy band gap, and reduced photon absorption rate of organic solar cells. question
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[0042]One embodiment contains 3,6-carbazole-benzo two (benzothiadiazole) copolymer preparation method, such as figure 1 shown, including the following steps:
[0043] Step S100, providing compound A and compound B.
[0044] A is: B is: Among them, R 1 , R 2 , R 3 for C 1 ~C 20 of alkyl.
[0045] Wherein the preparation of compound A comprises the following steps:
[0046] Step S111, adding 2-amino-5-nitroaniline to thionyl chloride (SOCl 2 ), add pyridine dropwise while stirring (the structural formula is Molecular formula is C 5 h 5 N,), wherein the solid-to-liquid ratio of 2-amino-5-nitroaniline to pyridine is 3mol:40ml, and then heated to 80°C~90°C for reflux reaction for 24 hours, then remove excess thionyl chloride, add after cooling Precipitate with deionized water, collect the solid, wash it and dry it in vacuum to obtain 5-nitro-2,1,3 benzothiadiazole.
[0047] The reaction formula of this step is:
[0048]
[0049] Step S112, mixing 5-nitro-2,1,3-...
Embodiment 1
[0100] This example discloses poly{9-octyl-3,6-carbazole-6,7-bis(3,7-dimethyl)octyl-benzo[2,1-e:3, 4-e] bis(benzothiadiazole)} (containing 3,6-carbazole-benzobis(benzothiadiazole) copolymer P1):
[0101]
[0102] The preparation process of the above-mentioned 3,6-carbazole-benzobis(benzothiadiazole) copolymer P1 is as follows:
[0103] 1.1. Preparation of compound 5-nitro-2,1,3 benzothiadiazole
[0104]
[0105] Add 2-amino-5-nitroaniline (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 80~90°C for 24h, stop the 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 vacuum-dried to obtain 21.7 g of the product 5-nitro-2,1,3-benzothiadiazole with a yield of 80%.
[0106] 1.2. Preparation of compound 4,7-dibromo-5-nitro-2,1,3 benz...
Embodiment 2
[0127] This example discloses poly{9-methyl-3,6-carbazole-6-(3,7-dimethyl)octyl-7-n-eicosyl-benzo[2, 1-e:3,4-e]bis(benzothiadiazole)} (containing 3,6-carbazole-benzobis(benzothiadiazole) copolymer P2):
[0128]
[0129] The above-mentioned preparation process containing 3,6-carbazole-benzobis(benzothiadiazole) copolymer P2 is as follows:
[0130] 2.1. The preparation of 4,4'-dibromo-6,6'-diiodo-linked 2,1,3 benzothiadiazole is the same as in Example 1.
[0131] 2.2. Preparation of 4,9-dibromo-6-(3,7-dimethyl)octyl-7-eicosylbenzo[2,1-e:3,4-e]bis(benzothio oxadiazole)
[0132]
[0133] Add 4,4'-dibromo-6,6'-diiodo-bi-2,1,3 benzothiadiazole (3.4g, 5mmol) into the three-necked flask, add 2,6-dimethyl-9- Triacyne (4.47g, 10mmol), 25ml DMF, stirred with nitrogen for 20min, added Bu 3 N (0.907g, 10mmol) and Pd(OAc) 2 (115 mg, 0.5 mmol), heated to 130 ° C, heated for 4 h, cooled, washed with water, extracted with dichloromethane to obtain an organic layer, dried over anhydrou...
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