title: In situ ligand reactions under hydrothermal conditions afford a novel zinc-substituted polyoxovanadate dimer.
abstract: A novel polyoxovanadate (POV), [Zn(2,2'-bpy)3]4[(ppz){{Zn(tepa)}2ZnAs8V13O41(H2O)}2][As8V14O42(0.5H2O)]2.4H2O (1, 2,2'-bpy = 2,2'-bipyridine, ppz = piperazine, tepa = tetraethylenepentamine), has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectra, thermogravimetric analysis, magnetic measurement, and single-crystal X-ray diffraction analysis. Crystal data for 1: orthorhombic, Aba2, a = 28.3414(14) A, b = 27.9995(16) A, c = 41.5819(16) A, V = 32997(3) A3, Z = 4, rho = 2.264 mg.cm-3. X-ray structure analysis shows that the structure of 1 consists of one unique zinc-substituted POV dimer and two POV monomers. Interestingly, the formation of the zinc-substituted POV dimer involves two new in situ ligand reactions under hydrothermal conditions, the intermolecular and intramolecular deamination coupling reactions of dien. Magnetization measurement revealed the presence of antiferromagnetic interaction between V(IV) ions in 1.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
authors.forename: Shou-Tian
authors.initials: ST
authors.lastname: Zheng
authors.forename: Ming-Hui
authors.initials: MH
authors.lastname: Wang
authors.forename: Guo-Yu
authors.initials: GY
authors.lastname: Yang