Abstract:
Amine-templated vanadium sulfates of the formula [HN(CH2)(6)NH][((VO)-O-IV)(2)(OH)(2)(SO4)(2)].H2O, I, [H3N(CH2)(2)NH3][V-III-(OH)(SO(4)2)].H2O, I, and [H2N(CH2)(4)NH2][((VO)-O-IV)(H2O)(SO4)(2)], III, have been prepared under hydrothermal conditions. These vanadium sulfates add to the new emerging family of organically templated metal sulfates. Compound I has a linear chain structure consisting Of V2O8 square-pyramid dimers connected by corner-sharing SO4 tetrahedra, creating four-membered rings along the chain. Both II and III possess simple linear chain topologies formed by VO6 octahedra and SO4 tetrahedra, with II having the tancoite chain structure. Compound I crystallizes in the triclinic space group P1 (No. 2) with a = 7,4852(4) Angstrom, b = 9.5373(5) Angstrom, c = 11.9177(6) Angstrom, alpha = 77.22degrees, beta = 76.47(2)degrees, gamma = 80.86degrees, Z = 2. Compound II: monoclinic, space group P2(1)/c (No. 14), a = 6.942(2) Angstrom, b = 10.317(3) Angstrom, c = 15.102(6) Angstrom, beta = 90.64(4)degrees, Z = 4. Compound III: triclinic, space group P1 (No. 2) with a = 6.2558(10) Angstrom, b = 7,0663(14) Angstrom, c = 15.592(4) Angstrom, (alpha = 90.46(2)degrees, beta = 90.47(2)degrees, gamma = 115.68(2)degrees, Z = 2. Magnetic susceptibility measurements reveal weak antiferromagnetic interactions in I and III and ferromagnetic interactions in II.
