TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The catalyst is mixture of organopalladium and organophosphine ligand or organopalladium, where the organopalladium catalyst is tris(dibenzylideneacetone) dipalladium, tetrakis(triphenylphosphine)palladium or bis(triphenylphosphine)palladium dichloride, and the organophosphine catalyst is tri (o-methyl) phenyl phosphate. The molar ratio of organopalladium catalyst to organophosphine ligand is 1:2-10. The molar ratio of total molar amount of (III) and (IV) to catalyst is 10:1-10000:1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I) comprises subjecting 4,9-dibromobenzo(lmn)(3,8)phenanthroline-1,3,6,8(2H,7H)-tetraone compounds of formula (III) and 4,9-bis(5-(trimethylstannyl)thiophen-2-yl)-(1,2,5)thiadiazolo(3,4-g)quinoxaline compounds of formula (IV) at molar ratio of 1:1-2:1 to Stille coupling reaction in an organic solvent containing catalyst under protective gas atmosphere, and finally separating and purifying to obtain (I). Preferred Method: The Stille coupling reaction is carried out at 70-120 degrees C for 24-72 hours. The separation and purification method of (I) comprises adding methanol to the reaction solution after completion of Stille coupling reaction, settling, filtering, washing and drying, then dissolving obtained solid in toluene, followed by adding to aqueous solution diethyl dithiocarbamate, heating the mixed liquid to 80-90 degrees C, stirring for stratification, separating the organic phase by column chromatography, removing solvent, sedimenting and filtering, extracting obtained solid with acetone for 3 days using Soxhlet, and finally sedimenting and filtering to obtain (I). (III) is prepared by refluxing 4,9-dibromoisochromeno(6,5,4-def)isochromene-1,3,6,8-tetraone with amine compounds of formula (R1-NH2) (V) at molar ratio of 1:10 in propionic acid under protective gas atmosphere for 8-14 hours, then cooling the reaction mixture to room temperature, then pouring into aqueous sodium hydroxide solution, extracting with chloroform, removing the organic solvent, washing with ethyl acetate, then subjecting the liquid to column chromatography using alumina chromatographic column, and removing solid to obtain a solid. (IV) is prepared by adding 4,9-bis(5-bromothiophen-2-yl)-(1,2,5)thiadiazolo(3,4-g)quinoxaline compounds of formula (VI) to tetrahydrofuran, adding n-butyl lithium, warming to room temperature, then stirring and reacting for 0.5 hours at -78 degrees C, cooling to -78 degrees C, adding trimethyltin chloride, stirring and reacting for 8-14 hours under room temperature, quenching the reaction using water, then removing tetrahydrofuran, extracting reaction mixture using mixture of chloroform and water, washing collected organic phase using water, drying by anhydrous sodium sulfate to remove solvent, where the molar ratio between (VI), n-butyl lithium and trimethyltin chloride is 1:3:3.