TECHNOLOGY FOCUS - POLYMERS - Preparation (disclosed): Diethynylthiophene compound of formula (Ia) and low-valence titanium complex of formula (Ib) are reacted at -100 degrees C to -20 degrees C in presence of inert solvent (e.g. diethyl ether) in inert atmosphere to obtain titanium cyclopentadiene skeleton-containing polymer of formula (Ic). Compound (Ic) and dihalogenated compound of formula: R1a-M1X2 are reacted, to obtain organic heteropolymer of formula (III).X=halo.Preferred Compound: The thiophene group-containing repeating unit (I) is preferably of formula (IV) or (V). The thiophene group-containing repeating unit (II) is preferably of formula (VI).M1=element chosen from group 15 and group 16 of periodic table;M2=element chosen from group 14, group 15 and group 16 of periodic table;R1a,R1b,R1c=alkyl, aryl or heteroaryl;R2a=element chosen from group 16 of periodic table;R2b=alkyl, aryl, heteroaryl, or metal atom chosen from group 11 of periodic table, which forms complex with ligand;ring Ar'=arene ring or heteroarene ring;R7=linear or branched alkyl, linear or branched alkoxy, or linear or branched alkylthio;Z1,Z2=element chosen from group 16 of periodic table;q=0-3;andor R61+R6b=cycloalkyl, or heterocyclyl containing heteroatom chosen from O, S or N. Preferred Definitions:    at least one of R6-a and R6b=linear or branched 4-14C alkyl;and    or R61+R6b=alkylenedioxy.    EXAMPLE - 0.21 g 2,5-Diethynyl-3-dodecylthiophene and 0.198 g tetraisopropoxy titanium were dissolved in 20 mL diethyl ether in argon atmosphere. 1.25 mL Diethyl ether solution of isopropyl magnesium chloride was added, stirred at -78 degrees C, heated at -50 degrees C for 12 hours, 0.206 g diphenyltin dichloride was added and heated at room temperature for 3 hours. Solvent was distilled off, obtained solid was dissolved in methylene chloride, then 50 mL aqueous solution of ethylenediaminetetraacetic acid was added and stirred for 2 hours. Organic phase was collected, dried using magnesium sulfate, dissolved in methylene chloride and reprecipitated with hexane, to obtain red-purple polymer with yield of 55%.