Room Temperature Synthesis and Structural Characterization of Sn(O3PCH2CH3): A Layered Phase of the Sn(II)-Organophosphonate System

The title compound, Sn(O3PCH2CH3), (1), was synthesized from a mixture of SnF2, CH3CH2PO3H2, and H2O in the mole ratio 1:0.85:1741 at 25°C for 1 h. Phosphonate (1) crystallizes in the orthorhombic space groupPbcawitha=7.785(2),b=7.450(1),c=20.026(4) A,V=1161.5(6) A3,Z=8, andR=0.0797. The two-dimensional structure of (1) is composed of corner sharing {SnO3} pyramids and {O3PC} tetrahedra that alternate to form four- and eight-member polyhedral rings within the layers. The ethyl groups of the phosphonate tetrahedra are directed outward from both faces of the layer, effectively forming inorganic layers alternating with organic bilayers.