Coordination architectures of large heavy metal cations (Hg2+ and Pb2+) with bis-tridentate ligands: Solution and solid-state studies

Abstract

Solution and solid state studies of the complexation of Hg2+ and Pb2+ by the homologous bis-tridentate ligands 1 and 2H2 obtained by condensation of bis(methylhydrazino)phenylpyrimidine and bis(hydrazino)phenylpyrimidine, respectively, with pyridine-2-carboxaldehyde, have provided evidence for the formation of both grid and rack species. With Hg2+, there is little indication for other than grid species, the grid complex [Hg4(2H2)4](CF3SO 3)8 being characterised crystallographically. With Pb 2+, the only crystalline species readily isolated are rack complexes of the ligands 1 and 2H2. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.