Crystal Structure of (NH4)2VO(SO4)2·H2O

Abstract

Ammonium vanadate(IV) oxosulfate with the composition (NH₄)₂VO(SO₄)₂·H₂O is synthesized and its crystal structure is investigated. It is found that the compound crystallizes in monoclinic crystal symmetry (space group P2₁, Z = 2) with lattice parameters: \(a = 4.65037\left( 4 \right)\;\acute{\mathring{\mathrm{A}}} \), \(b = 10.9870\left( 1 \right)\;\acute{\mathring{\mathrm{A}}} \), \(c = 9.5666\left( 1 \right)\;\acute{\mathring{\mathrm{A}}} \), β = 98.6273(5)°, \(V = 483.260\left( 8 \right){\acute{\mathring{\mathrm{A}}} ^3}\), Z = 2. The crystal structure of the compound is composed of VO₅H₂O octahedra sharing vertices of bridging groups SO₄ and making infinite chains parallel to the a axis. In the vertex of the VO₅H₂O octahedron there is a short terminal vanadyl bond V⁴⁺=O with a length of \(1.564\left( 7 \right)\;\acute{\mathring{\mathrm{A}}} \). A water molecule is trans positioned to this group at a distance of \(2.355\left( 6 \right)\;\acute{\mathring{\mathrm{A}}} \). The chains are linked with each other by (NH₄)⁺ ions.