Abstract

Full title: Two new hybrid organic/inorganic copper(II)-oxovanadate(V) diphosphonates: [Cu 2(phen) 2(O 3PCH 2PO 3)(V 2O 5)(H 2O)]·H 2O and [Cu 2(phen) 2(O 3P(CH 2) 3PO 3)(V 2O 5)] ·C 3H 8. Synthesis, structure, and magnetic properties. Two new hybrid organic/inorganic copper oxovanadium diphosphonates [Cu 2(phen) 2(O 3PCH 2PO 3)(V 2O 5)(H 20)]· H 2O (1) and [(Cu 2(phen) 2(O 3P(CH 2) 3PO 3)(V 2O 5)] ·C 3H 8 (2) have been obtained by hydrothermal synthesis. The compounds are monoclinic, and they crystallize in the space group P2 1/n with cell parameters of a = 11.788(2) Å, b = 17.887(3) Å, c = 14.158(2) Å, and ? = 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 ? = 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 T max = 64 K for (1) and Curie-like paramagnetic behavior for (2). © 2006 American Chemical Society.