Effect of conformation and combination of 1,3-bis(4-pyridylthio)propan-2-one upon coordination architectures: Syntheses, characterizations and properties

Self-assemblies of the conformationally labile ditopic ligand 1,3-bis(4-pyridylthio)propan-2-one (L) with square-planer nodes Co-II, Ni-II and with linear nodes Ag-I have afforded three new coordination polymers, {[Ni(L)(2)Cl-2]}(infinity) (1), {[Co(L)(2)(SCN)(2)center dot(DMF)(2))(proportional to) (2) and {[AgL]NO3 infinity (3), respectively. Structural analyses of these polymers and conformational analyses of L have revealed that metal-assisted conformational selectivity and unique combinations of conformational. isomers of L around the metal nodes probably play the key role in determining the structural topologies. In 1, a C-2 symmetric array of two sorts of conformational isomers of L around Ni-II centers results in a 3D interpenetrating framework, while in 2 a combination of two types of conformational isomers of L around the inversion center Coll provides a 3D interpenetrating architecture of CdSO4-like topology. In 3, L presents only a typical conformation, with higher steric energy, that links linear nodes Ag-1, leading to a ID U-Iike chain. The magnetic properties of 1 and 2, as well as the interesting fluorescent properties of 3, have also been investigated. (c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.