Solid state coordination chemistry of copper(II) lactate complexes with the twisted ligands 4,4′-dipyridyldisulfide and bis(4-pyridylthio)methane

The 1D coordination polymer 1∞[Cu(HL)2(SS)]·4H2O (1) and the molecular compound [Cu2(HL)4(SCS)3] (2) [where SS = 4,4′-dipyridyldisulfide, SCS = bis(4-pyridylthio)methane and HL = lactate] have been prepared by reaction of the SS and SCS ligands with copper(II) lactate. X-ray structural analysis revealed that in 1 the SS ligand acts as an N,N′-bis(monodentate) system, whereas in 2 the SCS ligand acts in an N,N′-bis(monodentate) manner to produce a dinuclear compound and also as a monodentate terminal ligand. Hydrogen bonding interactions join the polymeric chains of 1 and the molecules of 2 to generate 3D networks. The thermal behaviour of the two compounds was investigated and the reversibility of the dehydration–rehydration processes in 1 was also evaluated.