Hydrothermal synthesis,crystal structures,and magnetic properties of a novel three-dimensional iron phosphite:NH_4 centre dot [Fe_2~(II)Fe~(III)(HPO_3)_4]

摘要

A three-dimensional iron phosphite,NH_4 centre dot [Fe_2~(II)Fe~(III)(HPO_3)_4],has been synthesized under mild hydrothermal conditions and characterized by single crystal X-ray diffraction.The compound crystallizes in the monoclinic space group P2_1/c,with unit cell parameters,a=12.4397(3)A,b=10.1642(3)A,c=9.3201(3)A,and Z=4.The compound forms three-dimensional framework with six-membered channels along the c-axis.The Fe center in the framework adopts slightly distorted octahedral coordination geometry and is bridged by the pseudo-pyramidal phosphites.Magnetic measurement indicates the anti-ferromagnetic interactions in the title compound.