Abstract

A new W(V) diphosphate KWOP₂O₇ isotypic to the Mo(V) compound has been synthesized. It crystallizes in the space group P12₁/n1 with a = 5.0629(3), b = 11.770(2), c = 11.551(1), β = 91.039(6). This mixed framework of corner-sharing P₂O₇ groups and WO₆ octahedra forms large tunnels where the K⁺ ions are located. This study evidences for the first time the ability of W(V) to form tungstyl ions in a phosphate matrix, the W(V) octahedra being characterized by an abnormally short W–O bond of 1.687 Å, similarly to Mo(V).