Hydrothermal synthesis and crystal structure of a lead vanadium monophosphate hydrate with an open structure: Pb2V2O4(PO4)(2)center dot 2H(2)O

A new lead vanadium(V) monophosphate hydrate Pb2V2O4(PO4)(2). 2H(2)O has be en synthesized using hydrothermal techniques. It crystallizes in the P1 2(1 )/a 1 space group with a = 10.008(1) Angstrom, b = 10.140(1) Angstrom, c = 10.569(2) Angstrom and beta = 93.89(1)degrees. Its structure consists of co rner-sharing VO6, VO4(H2O)(2) octahedra and PO4 tetrahedra forming [VPO7](i nfinity) layers interconnected through [VPO6(H2O)(2)](infinity) chains. Suc h a tridimensional framework delimits large interconnected cavities occupie d by lead cations. This structure is compared to the only two lead vanadoph osphate hydrates alpha-beta Pb(VO)(2)(PO4)(2). 4H(2)O that are actually kno wn.