Synthesis, characterization and 1D helical chain crystal structure of [Cu(DBA)2(1,10-phen)]n and [Cd(DBA)2(1,10-phen)2] (DBA = benzilic acid)

Two novel complexes [Cu(DBA)(2)(1,10-phen)](n) (1) and [Cd(DBA)(2)(1,10-phen)(2)] (2) [HDBA = benzilic acid: (C6H5)(2)C(OH)COOH] have been synthesized and characterized by element analysis and fluorescence spectroscopy. The crystal structures of compounds 1, 2 and HDBA (3) were also determined. Complex I is a one-dimensional (ID) helical infinite chain, in which [(1,10)-phen]Cu-(II) units were bridged by benzilic acid. Complex 2 is a mononuclear structure, and is self-assembled through pi-pi stacking interactions to form a ID helical chain. Compound 3 is self-assembled to form a ID helical chain through hydrogen bonds interactions. Thermal analyses indicate that complexes 1 and 2 are stable under 200 and 254 degrees C in solid state, respectively. (C) 2006 Elsevier B.V. All rights reserved.