A supramolecular spin crossover Fe(III) complex and its Cr(III) isomer: stabilization of water-chloride cluster within supramolecular host.

摘要: The metal complexes, [M(Hdammthiol)2]Cl·3H2O [M = Cr(III) (1), Fe(III) (2)] [where H2dammthiol is the thiol form of ligand, diacetylmonoxime morpholine N-thiohydrazone] were synthesized by template reactions diacetylemonoxime with morpholineN-thiohydrazide in presence CrCl3·6H2O and FeCl3·6H2O. Both complexes (1 2) characterized single crystal X-ray crystallography, spectroscopic (IR UV-vis), Mossbauer TGA analyses. studies both show that supramolecular hosts, constructed discrete mononuclear channels along c-axis which are filled up water–chloride clusters. In 1D chain chair-like architecture within hosts presents novelty. magnetic measurement study complex shows a spin crossover from S 1/2 at 2.5 K to 5/2 300 K. At very low temperature, strong cooperative hydrogen bonding interactions stabilizes state.