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)

Abstract

Two novel complexes [Cu(DBA) 2(1,10-phen)] n ( 1) and [Cd(DBA) 2(1,10-phen) 2] ( 2) [HDBA = benzilic acid: (C 6H 5) 2C(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 1 is a one-dimensional (1D) 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 π–π stacking interactions to form a 1D helical chain. Compound 3 is self-assembled to form a 1D helical chain through hydrogen bonds interactions. Thermal analyses indicate that complexes 1 and 2 are stable under 200 and 254 °C in solid state, respectively.