Solid state coordination chemistry of the oxovanadium-diphosphonate/copper-bipyrimidine system: Crystal structures of [{Cu2(bpyr)}VO(H2O)(HO3PCH2PO3)2] and [{Cu2(bpyr)}{Cu2(bpyr)(H2O)2}(VO2)2(HO3PCH2PO3)2(HO3PCH2PO3H)2]

Hydrothermal reactions yield a series of materials incorporating the {Cu2(bpyr)}4+ building block. Two of the materials, [{Cu(bpyr)}VO(H2O)(HO3PCH2PO3)2] and [{Cu2(bpyr)}{Cu2(bpyr)(H2O)2}(VO2)2(HO3PCH2PO3)2(HO3PCH2PO3H)2] · 2H2O, are members of the copper(II)-organonitrogen ligand/oxovanadium-diphosphonate family. The structure of [{Cu(bpyr)}VO(H2O)(HO3PCH2PO3)2] is shown.