A {Cu6}-containing inorganic-metal-organic sandwich-type tungstoantimonite and its 3D supramolecular framework

A hexagonal {Cu-6} cluster-containing tungstoantimonite, [Cu(enMe)(2)(H2O)](2){Cu(enMe)(2)[Cu(enMe)](3)[Cu(H2O)](3)(SbW9O33)(2)}center dot 5H(2)O (1, enMe = 1,2-diaminopropane) has been successfully synthesized under hydrothermal conditions. The {Cu-6} cluster in I is stabilized by both the inorganic O-donor ligand {B-alpha-SbW9O33}(9-) and the organic N-donor ligand enMe, leading to a hybrid inorganic-metal-organic sandwich-type polyoxometalate. The sandwich-type polyoxoanions are further connected into a 3D supramolecular framework via hydrogen bonding interactions between 1,2-enMe molecules and the sandwich-type polyoxoanions. The magnetic study indicates that intramolecular ferromagnetic Cu-Cu interactions exist in the hexanuclear metal-cluster. Crown Copyright (C) 2009 Published by Elsevier B.V, All rights reserved.