The title compound, Sn), was synthesized hydrothermally using methylphosphonic acid and tin oxalate in the presence of butylamine. It crystallizes in the monoclinic space group P2 1 /m (no. 14) with the lattice parameters a=4.723(1), b= 15.196(1), c=6.147(1) A ˚, b=102.1(1)°, V=431.3(1) A ˚3, 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 SnO 4 units and tetrahedral O 3 PC 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.controlling the structure of a solid. In this paper, the hydrother-Paper 8/00488I;

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The reactions of tin(II) chloride with phosphonic and phosphinic acids under hydrothermal conditions result in structures with varying dimensionalities. The synthesis and characterization of eight new structures is described. SnCl(HPhPO2), I, triclinic, P1̄ (No. 2), has lattice parameters a = 5.4767(6) Å, b = 8.8106(9) Å, c = 9.5219(10) Å, α = 104.564(2)°, β = 95.440(2)°, γ = 99.349(2)°, and V = 434.34(8) Å3. (SnCl)2MePO3, II, triclinic, P1̄ (No. 2), has a = 4.7275(17) Å, b = 6.152(2) Å, c = 13.632(5) Å, α = 81.299(7)°, β = 89.052(7)°, γ = 89.781(7)°, and V = 391.8(3) Å3. Sn2Cl(EtPO3)EtPO2OH, III, monoclinic, P21/m (No. 11), has a = 4.814(4) Å, b = 8.530(4) Å, c = 15.214(8) Å, β = 99.09(10)°, and V = 616.9(7) Å3. β-SnEtPO3, IV, monoclinic, Cc (No. 9), has a = 4.6415(13) Å, b = 18.695(5) Å, c = 6.4964(18) Å, β = 99.907(4)°, and V = 555.3(3) Å3. SnMePO3, V, monoclinic, P21/c (No. 14), has a = 4.5998(7) Å, b = 15.430(2) Å, c = 6.5861(10) Å, β = 100.719(3)°, and V = 459.30(12) Å3. Sn2(O3P(CH2)2PO3), VI, monoclinic, P21/c (no. 14), has a = 4.6435(6) Å, b = 13.4512(16) Å, c = 6.4767(8) Å, β = 100.258(2)°, and V = 398.07(9) Å3. SnPO3CH2COOH, VII, monoclinic, P21/n (No. 14), has a = 5.490(2) Å, b = 4.890(2) Å, c = 21.884(9) Å, β = 90.505(7)°, and V = 587.4(4) Å3. (NH4)2Sn(O3PCH2PO3), VIII, orthorhombic, Pbca (No. 61), has a = 10.3417(10) Å, b = 10.0475(10) Å, c = 16.9927(17) Å, and V = 1765.7(3) Å3. For the first time, a three-ring (3R) phosphonate chain and an open-chain (i.e., no rings) phosphinate “wire” have been isolated. The phosphate analogues of these structures serve as key structural motifs in tin(II), zinc(II), and cobalt(II) phosphates, underscoring their role in the formation of framework phosphates. We propose that metal phosphate wires could play an important role in the formation of open-framework materials.

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