Synthesis and structural characterization of a novel tin(II) phosphonate,Sn₂(O₃PCH₃)(C₂O₄)

Abstract

The title compound, Sn₂(O₃PCH₃) (C₂O₄), was synthesized hydrothermally using methylphosphonic acid and tin oxalate in the presence of butylamine. It crystallizes in the monoclinic space group P2₁/m (no. 14) with the lattice parameters a=4.723(1), b= 15.196(1), c=6.147(1) Å, β=102.1(1)°, V=431.3(1) ų, Z=4. The final R values are R=2.99, R_w=6.1 and S=1.04. The structure comprises a network of vertex-linked truncated square-pyramidal SnO₄ units and tetrahedral O₃PC units which gives rise to threemembered rings, via a three-coordinate oxygen, which are linked together forming one-dimensional chains. These chains are connected together via the oxalate group forming the structure.