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

A synthesis between NH4VO3 and Zn(CH3COO)2·2H2O 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]2V10O28 ⋅ 4H2O 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 °C.

The novel compound has been successful synthesized and characterized. Its crystal structure revealed a polyoxovanadate 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]2V10O28 ⋅ 4H2O compound. The non-covalent weak interactions occurred via N–H···O and O–H···O hydrogen bondings make the supramolecular assembly network.Figure optionsDownload as PowerPoint slideHighlights
► A simple route to synthesis with a high yield and mild condition.
► IR and TGA studies clearly confirmed its component of novel polyoxovanadate.
► Polyoxovanadate is a 3D network based on decavanadate and binary cations