Synthesis, characterization and photovoltaic properties of new nanoscale carbon-rich polyplatinaynes with alternating donor and acceptor units

Development of carbon-rich organometallic systems containing rigid, π-conjugated fragments is a hot research topic. Construction of donor-acceptor skeleton with the thiophene donor group and the acceptor units such as benzothiazole and fluorenone can usually improve the electronic properties of the resulting organic materials. New nanoscale-sized organometallic acetylide polymers of platinum(II) bridged by bis(thienyleneethynylene)-benzothiadiazole moiety P1 and bis(thienyleneethynylene)-fluorenone moiety P2 have been synthesized in which an additional triple bond was inserted between the thiophene ring and the acceptor unit in the central spacer unit. The photophysical and electrochemical properties of P1 and P2 were investigated and compared with those of their model diplatinum(II) complexes and related polymers with other heteroaromatic spacers.