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

A hexagonal {Cu6} cluster-containing tungstoantimonite, [Cu(enMe)2(H2O)]2{Cu(enMe)2[Cu(enMe)]3[Cu(H2O)]3(SbW9O33)2}·5H2O (1, enMe = 1,2-diaminopropane) has been successfully synthesized under hydrothermal conditions. The {Cu6} cluster in 1 is stabilized by both the inorganic O-donor ligand {B-α-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.