A Hybrid Metalloarsenate 3D Framework−1D Interrupted Metal Oxide

Complex metal arsenates of the stoichiometry M1-xM‘6(OH)3(AsO4H2x/3)3(HAsO4), M = M‘ = Co, Ni, have been
synthesized under hydrothermal conditions. The two compounds display a very similar structural topology to that
of the mineral dumortierite, an uncommon complex oxyborosilicate of aluminum. The hybrid structures consist of
well separated, vacancy interrupted chains of face sharing MO6 octahedra, with short M···M distances near 2.5 Å,
embedded in a metalloarsenate 3D framework having the topology of the aluminosilicate cancrinite. The framework
also contains a quadruply bridging hydroxide ion. Magnetic susceptibility measurements reveal a strong
antiferromagnetic interaction and magnetic transition to low temperature spin canted phases below 51 K (Co) and
42 K (Ni). The material may be considered as a zeotype framework structure templated by an interrupted one-dimensional metal oxide.