(Invited) DAN Assisted Formation of Charge Transfer Complex from Highly Charged Fullerenes and Conjugated Polymer

Wednesday, 27 May 2015: 11:20
Lake Huron (Hilton Chicago)
H. L. Wang (Los Alamos National Laboratory), M. Cotlet (Brookhaven national Laboratory), K. Chengju, Y. Park (Los Alamos National Laboratory), Z. Liu (Brookhaven national Laboratory), and H. Tsai (Los Alamos National Laboratory)
Water-soluble, same charged, cationic conjugated poly(phenylenevinylene) (PPV) and cationic fullerenes were complexed with negatively charged single stranded DNA and double stranded DNA via electrostatic and pi-pi interactions. The photoinduced charge transfer complex (PPV/DNA/C60) has a charge transfer and separation efficiencies at least comparable to those observed from oppositely charged, cationic PPV and anionic fullerene. DNA serves as a template that straightens the PPV chain conformation which leads to an enhanced quantum yield. Meanwhile, DNA allows incorporation of C60 by overcoming the electrostatic repulsion between PPV and C60. While oppositely charge donor and acceptor molecules feature charge transfer in the form of static quenching, for DNA-assisted charge transfer complexes, the charge transfer proceeds as a combination of static and dynamic quenching for ssDNA and purely dynamic for dsDNA.