Temperature dependence of the crystal chemistry of the oxovanadium-ethylenediphosphonate/copper(II)-2,2′-bipyridine system.: Crystal structures of the two-dimensional [Cu(bpy)VO2(O3PCH2CH2PO3H)]•1.5H2O and of the one-dimensional [Cu(bpy)VO2(O3PCH2CH2PO3H)]

Three different materials of the oxovanadium-ethylenediphosphonate/copper(II)-bipyridine system {V/O/((CH2)(2)(PO3Hx)(2)}((4-x)-)/ Cu(II)(bpy)] were isolated via hydrothermal synthesis from identical starting solutions with temperatures as the only variable. The phases isolated at 120 and 230 degreesC are both two-dimensional networks, [Cu(bpy)VO2(O3PCH2CH2PO3H)].1.5H(2)O) (1.1.5H(2)O) and [Cu(bpy)VO(O3PCH2CH2PO3)] (3), respectively, while the phase produced at the intermediate temperature of 180 degreesC is the one-dimensional [Cu(bpy)VO2(O3PCH2CH2PO5H)] (2). Despite the unexpected absence of correlation between temperature and dimensionality, the number of Cu(II) atoms per 1000 Angstrom(3) increases in the order 2.31:2.57:2.62 for 1:23, as expected. (C) 2004 Elsevier SAS. All rights reserved.