TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The catalyst is tris(dibenzylideneacetone)dipalladium, tetrakis(triphenylphosphine)palladium or bis(triphenylphosphine)palladium dichloride, where molar ratio between the catalyst and (II) is 1:2000-1:5.    TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): The preparation of (I), comprises carrying out Stille coupling reaction of 1,6-dibromo-8,11-dithia-7,9,10,12-tetraaza-dicyclopenta(c,g)phenathrene compounds of formula (II) with 2,6-bis-tributylstannanyl-dithieno(3,2-b;2',3'-d)thiophene compounds of formula (III) in an organic solvent in presence of organic palladium catalyst under a protective gas atmosphere, then separating and purifying the obtained reaction mixture to obtain final product, where molar ratio of (II) to (III) is 1:1.5-1.5:1. Preferred Method: The Stille coupling reaction is carried out at 50-120 degrees C for 6-100 hours. Purification of (I) is carried out by extracting the reacted solution with mixture of toluene and deionized water, retaining the organic phase, precipitating with ethanol, filtering, drying, then dissolving obtained solid in chloroform, removing the solvent, and purifying by neutral alumina chromatography, then precipitating with methanol, filtering and washing with acetone, again precipitating with methanol and filtering. Preparation of (II), comprises reacting 7,7'-dibromo-5,5'-diiodo-4,4'-bibenzo(c)(1,2,5)thiadiazole (IV) with alkyne derivative of formula (V) in a solvent containing an organic base and a catalyst under a protective gas atmosphere, where molar ratio of (IV) to (V) is 1:2, the organic base is triethylamine, and the catalyst is palladium acetate. Purifying (II) by extracting the reacted solution with water and dichloromethane sequentially, retaining organic layer, drying over anhydrous sodium sulfate, filtering and removing the solvent, and isolating by silica gel column chromatography. Preparation of (III), comprises reacting 2,6-dibromo-dithieno(3,2-b;2',3'-d)thiophene derivative of formula (VI) with n-butyllithium in tetrahydrofuran at -78 degrees C for 2 hours under a protective gas atmosphere, then reacting with tributyltin chloride at -78 degrees C for 1 hour and then at room temperature for 6 hours, terminating the reaction by adding aqueous sodium chloride, extracting with anhydrous ether, drying organic phase, filtering and removing the solvent from filtrate to obtain (III), where molar ratio between (VI) and n-butyllithium is 1:2.