Cs3Fe5O(OH)(AsO4)5: a novel iron(III) arsenate containing four-, five- and six-coordinated iron atoms

Abstract

A novel iron(III) arsenate is synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, which reveals a framework structure of vertex- and edge-sharing Fe–O polyhedra crosslinked by vertex-sharing AsO₄ tetrahedral in a manner that generates tunnels and cavities occupied by Cs⁺ cations.