Abstract

Full title: Two new hybrid organic/inorganic copper(II)-oxovanadate(V) diphosphonates: [Cu2(phen)2(O3PCH2PO 3)(V2O5)(H2O)]·H 2O and [Cu2(phen)2(O3P(CH 2)3PO3)(V2O5)] ·C3H8. Synthesis, structure, and magnetic properties. Two new hybrid organic/inorganic copper oxovanadium diphosphonates [Cu 2(phen)2(O3PCH2PO 3)(V2O5)(H20)]· H 2O (1) and [(Cu2(phen)2(O3P(CH 2)3PO3)(V2O5)] ·C3H8 (2) have been obtained by hydrothermal synthesis. The compounds are monoclinic, and they crystallize in the space group P21/n with cell parameters of a = 11.788(2) Å, b = 17.887(3) Å, c = 14.158(2) Å, and β = 93.99(0)° and in the space group C2/c with cell parameters of a = 11.025(1) Å, b = 18.664(2) Å, c = 15.054(2) Å, and β = 90.06(0)°, respectively. Both compounds present two-dimensional frameworks built up from infinite chains of corner-sharing vanadium tetrahedra and diphosphonate groups connected by copper tetramers for (1) and copper dimers for (2). The remarkable feature of (2) is the encapsulation of propane molecules, stabilized by strong hydrogen bonding between the layers. The magnetic properties of the compounds have been investigated showing antiferromagnetic coupling with Tmax = 64 K for (1) and Curie-like paramagnetic behavior for (2). © 2006 American Chemical Society.