A Vanadium(IV) Phosphite with a Pillared Layered Structure: Hydrothermal Synthesis and Characterization of (VO)₄(4,4‘-bpy)₂(HPO₃)₄

A novel vanadium(IV) phosphite, (VO)4(4,4‘-bpy)2(HPO3)4, was hydrothermally synthesized and characterized by single-crystal X-ray diffraction. This compound crystallizes in the monoclinic system with the space group C2/c and cell parameters a = 35.970(3) Å, b = 15.9400(13) Å, c = 10.7681(7) Å, β = 101.073(4)°, and Z = 8 with R1 = 0.0482. The structure of the compound consists of trigonal bipyramidal [VO4N] and pseudopyramidal [HPO3] blocks, which are connected by corner-sharing, to form vanadium phosphite layers in the bc plane. These layers are further linked through 4,4‘-bpy pillars, generating a 3D framework. Thermogravimetric analysis and magnetic susceptibility data for this compound are given.