Abstract: Two novel drum organooxotin clusters [PhCH₂Sn(O)(O₂CC₄H₃S)]₆·2CH₂Cl₂(1) and [PhCH₂Sn(O)(O₂CC₃H₂NO)]₆·2CH₂Cl₂(2) were synthesized by the reaction of [(PhCH₂)₃Sn]₂O with 2-thiophenecarboxylic acid and 2-oxazoliylcarboxylcarboxylic acid in 1;2 molar ratio. Their crystal structures were determined by X-ray single crystal diffraction. Crystal 1 belongs to triclinic system with space group p1, a=1.276 0(3) nm, b=1.305 6(3) nm, c=1.334 3(3) nm, α= 105.65(3)°, β=96.27(3)°, γ=97.20(3)°, Z=1, V=2.099 7(7) nm³, D_c=1.809 g/cm³, μ=2.097mm^-1, F(000)=1 116, R=0.065 1, _wR=0.129 2. Crystal 2 belongs to triclinic system with space group p1, a=1.224 0(4) nm,b=1.367 3(4) nm, c=1.374 4(4) nm, α=107.760(4)°, β=98.069(5)°, γ=91.480(5)°, Z=2, V=2.163 1(12) nm³, D_c=3.373 g/cm³, μ=3.799mm^-1, F(000)=2 136, R=0.038 2, _wR= 0.079. Their structures show a distorted octahedron configuration with six-coordination for the central tin atoms. In crystal 1, the molecules are packed in the unit celLIn one-dimensional chain structure through weak interaction between the sulfur atom and one of the sulfur of an adjacent molecule.

Key words: Organooxotin cluster, 2-Thiophenecarboxylic acid, 2-Oxazolecarboxylic acid, Synthesis, Crystal structure