TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The catalyst is tris(dibenzylideneacetone)dipalladium, tetrakis(triphenylphosphine)palladium or bis(triphenylphosphine)palladium dichloride. The molar amount of the catalyst is 0.05-20% the molar amount of (III).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I) comprises dissolving 8,11-dithia-7,9,10,12-tetraaza-dicyclopenta(c,g)phenathrene compounds of formula (II) and 2,5-bis(tributylstannyl)thieno(3,2-b)thiophene compounds of formula (III) at molar ration of 1:1.5-1.5:1 in an organic solvent, then adding catalyst to the solution to form mixed solution, subjecting the mixed solution to Stille coupling reaction at 50-120 degrees C for 6-108 hours under an inert gas atmosphere, and then cooling to room temperature to obtain (I). Preferred Method: The separation and purification process comprises adding de-ionized water and toluene to the reaction solution and performing extraction, collecting organic phase, evaporating product and the mixed solution of toluene to dryness to about 5 ml using vacuum distillation method, dropping 400 ml anhydrous ethanol and stirring continuously, precipitating of solid, filtering and drying to obtain a solid powder, then e dissolving the solid powder using chloroform, performing separation using a neutral alumina chromatographic column, decompression removing the organic solvent under reduced pressure, settling of methanol, filtering, extracting obtained solid for many times in a Soxhlet extractor extracting device using acetone, settling of methanol,and filtering overnight under vacuum pump to obtain (I). The preparation method of (II) comprises: (a) mixing 4-nitrophenyl-1,2-diamine and thionyl chloride in a solid-liquid ratio of 0.2295 g:1 ml in presence of pyridine catalyst, refluxing at 90 degrees C and reacting for 24 hours, distilling of excess of thionyl chloride and cooling the mixture to room temperature to obtain 5-nitro-2,1,3 benzothiadiazole; (b) mixing the 5-nitro-2,1,3 benzothiadiazole and hydrobromic acid with concentration of 40% at solid-liquid ratio of 0.69 g:1 ml, heating to 127 degrees c and refluxing for 30 minutes, dropping liquid bromine slowly and refluxing for 4 hours to obtain 4,7-dibromo-5-nitro-2,1,3-benzothiadiazole, where the solid-liquid ratio of 5-nitro-2,1,3-benzothiadiazole to liquid bromine is 1 g:1.09 ml; (c) adding the 4,7-dibromo-5-nitro-2,1,3-benzothiadiazole and copper powder at mass ratio of 1.07:1 to N,N-dimethyl formamide and mixing , then heating to 120 degrees C and reacting for 3 hours, and cooling to room temperature to obtain 4,4'-dibromo-6,6'-dinitro-linked 2,1,3 benzothiadiazole, where the solid-liquid ratio of 4,7-dibromo-5-nitro-2,1,3-benzothiadiazole to N,N-dimethyl formamide is 1 g: 8.82 ml; (d) adding ,4'-dibromo-6,6'-dinitro-linked 2,1,3 benzothiadiazole and tin dichloride at molar ratio of 1:10 to dried tetrahydrofuran, raising the temperature to 100 degrees C, and heating and refluxing for 10 hours, cooling, then adding sodium nitrite solution dropwisely and reacting for 30 minutes at 5 degrees C, adding potassium iodide solution, stirring vigorously and reacting for 12 hours to obtain 4,4'-dibromo-6,6'-diiodo-linked 2,1,3-benzothiadiazole, where the molar ratio of sodium nitrite to 4,4'-dibromo-6,6'-dinitro-linked 2,1,3-benzothiadiazole is 1.885:1, and the molar ratio of potassium iodide to 4,4'-dibromo-6,6'-dinitro-linked 2,1,3-benzothiadiazole is 18.6:1; and (e) mixing obtained 4,4'-dibromo-6,6'-diiodo-linked 2,1,3-benzothiadiazole with acetylene compounds of formula (R1-C(C)-R2) (IV), adding 25-80 ml N,N-dimethylformamide, introducing nitrogen gas and stirring for 20 minutes, and then adding tributylamine and palladium acetate, heating 130 degrees c and reacting for 4 hours, and cooling to obtain (II), where the molar ratio of tributylamine to 4,4'-dibromo-6,6'-diiodo-linked 2,1,3-benzothiadiazole is 2:1, and the molar ratio of palladium acetate to 4,4'-dibromo-6,6'-diiodo-linked 2,1,3-benzothiadiazole is 1:10. The preparation method of (III) comprises mixing 2,5-dibromo-thieno(3,2-b)thiophene compounds of formula (V) with tetrahydrofuran solvent in an inert atmosphere, cooling to -78 degrees C, adding n-butyl lithium and reacting for 1-2 hours, adding tributyltin chloride and reacting for 1 hour, and then warming to room temperature and reacting for 6 hours to obtain (III), where the molar ratio of (V) to n-butyl lithium is 1:2, and the molar ratio of (V) to tributyltin chloride is 1:2. Preferred Components: The organic solvent is tetrahydrofuran, ethylene glycol dimethyl ether, benzene or toluene. The gas in inert gas atmosphere is nitrogen or argon gas.