Spectroscopy, thermal analysis and crystal structure of a novel diammonium bis[hexaaquazinc(II)] decavanadate tetrahydrate

A synthesis between NH4VO3 and Zn(CH3COO)(2)center dot 2H(2)O in aqueous solution resulted in a novel decavanadate compound. Its single crystal X-ray diffraction analysis revealed the decavanadate cage-like structure [V10O28](6-) form the discrete anionic cluster which associated to binary cationic groups. (NH4)(+) and [Zn(H2O)(6)](2+), into the neutral (NH4)(2)[Zn(H2O)(6)]2V(10)O(28)center dot 4H(2)O compound. The principal feature of the crystal supramolecularity is non-covalent weak interactions from two cations and decavanadates forming the 3D framework. The FT-IR spectra illustrate the strong bands of V=O. Thermogravimetric studies reveal the complete removal of all water molecules ammonium cations and vanadate in multiple steps ranging from 30 to 400 degrees C. (C) 2011 Elsevier B.V. All rights reserved.