TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The primary catalyst is palladium acetate. The content of primary catalyst is 10%.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): 8,15-Dibromo-11,12-diiodo-5,18-dithia-4,6,17,19-tetraazapentacyclo(11.7.0.02,10.03,7.016,20)icosa-1(13),2(10),3,6,8,11,14,16,19-nonaene is reacted with organic compound of formula: R2-CC-R3 in the molar ratio of 1:2 in the presence of catalyst and alkali solution at 100-150 degrees C for 2-6 hours under the protection of inert atmosphere, to obtain compound dinitrogen-containing compound of formula (II). The obtained compound and fluorene derivative of formula (III) in tetrahydrofuran solvent at -78 degrees C, then n-butyl lithium is added and reaction is stirred for 2 hours. The tributyl tin chloride is added, continuously reacted to room temperature reaction for 1-6 hours, to obtain fluorene derivative of formula (IV). The secondary solvent is added in the presence of catalyst, and reacted for 100 hours, to obtain thiophene pyrrole-benzodiazepine(benzothiadiazole)copolymer. Preferred Composition: The molar ratio of compound (IV) and n-butyl lithium is 1:2. The molar ratio of tributyl tin chloride, n-butyl lithium, inert atmosphere, compound (III) and compound (V) is 1:1.5:1.5:1. The alkali solution is butyl nitride solution. The primary solvent is N,N-dimethylformamide. The secondary catalyst is tetra(triphenylphosphine)palladium, tris(dibenzylideneacetone)palladium or bis(triphenyl phosphine)palladium dichloride. The secondary solvent is tetrahydrofuran, ethylene glycol dimethyl ether, diethyl ether, benzene or toluene. Preferred Process: The nitrogen-containing compound (II) is obtained by adding 4,7-dibromo-5-nitro-2,1,3-benzothiadiazole in N,N-dimethylformamide solvent in the presence of catalyst, heating at 120 degrees C for 3 hours, obtaining 7-bromo-4-(7-bromo-5-nitro-2,1,3-benzothiadiazol-4-yl)-5-nitro-2,1,3-benzothiadiazole, adding obtained compound and tin chloride in tetrahydrofuran solvent, raising the temperature at 100 degrees C, heating and refluxing for 10 hours, and stopping the reaction.