The crystal structure of bis(triphenyltin)telluride and the interpretation of the 119Sn Mössbauer and nuclear magnetic resonance data of the bis(triphenyltin) and bis(trimethyltin) chalcogenides

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Abstract
The structure of (Ph3Sn)2Te has been determined by X-ray crystallography. The compound crystallizes in the space group C2/c with a = 18.578(3) Å, b = 7.731(1) Å, c = 25.272(4) Å, β = 117.17(1)°, ρc = 1.702 g cm−3, ρo(CHCl3/CH2I2) = 1.69 g cm−3, and Z = 4. Intensities were measured for 2853 independent reflections (2θ ≤ 50°) of which 2044 were observed (I ≤ 2.3σ(I)) and used in subsequent refinement (final R values were R = 0.034 and Rw = 0.045). The (Ph3Sn)2Te molecule exhibits a "bent" structure in which Sn—Te—Sn = 103.68(2)° and Te—Sn = 2.7266(6) Å and in which the Te atom lies on a crystallographic two-fold axis. Comparison of the present structure with corresponding selenide and sulphide analogues indicates that in all three cases the environment about tin corresponds to that of sp3 hybridisation. The 119Sn Mössbauer quadrupole splittings of (Ph3Sn)3E and (Me3Sn)2E, where E = S, Se, or Te, show a correlation with the 119Sn solution nmr chemical shifts and this correlation is discussed.

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