Copper(I) complexes of 6,6'-disubstituted 2,2'-bipyridine dicarboxylicacids: new complexes for incorporation into copper-based dye sensitizedsolar cells (DSCs)

摘要

Synthetic approaches to 6,6'-disubstituted-2,2'-bipyridine ligands bearing carboxylic acid substituentsat the 4,4' or 5,5'-positions are described. Copper(t) complexes with these ligands have been preparedfor use in copper-based dye-sensitized solar cells. The single-crystal structures of 6,6'-dimethy1-2,2'-bipyridine-4,4'-dicarboxylic acid (H24), [H36][CF,CO2]?2CF3CO2H (H26 = 6,6'-dipheny1-2,2'-bipyridine-4,4'-dicarboxylic acid) and 4[Cu(H22)(H2)?31120 (H22 = 6,6'-dimethyl-2,2'-bipyridine-5,5'-dicarboxylic acid) are described, as well as those of the intermediates (1E,5E)-1,6-di(2-furyl)hexa-1,5-diene-3,4-dione and 4,4'-di(2-furyl)-6,6'-dimethyl-2,2'-bipyridine (3), and the copper(t) complex[Cu(3)2][PF6]. The roles that classical and non-classical hydrogen bonding and tc-stacking interactionsplay in determining the solid-state packing in these structures are discussed. Preliminary studies ofDSCs with these complexes are reported.