16413-88-0Relevant articles and documents
MOLECULAR STRUCTURES OF ACETYLENE DERIVATIVES OF TIN. Part IV. Gas-phase electron-diffraction study of tetraethynyltin, Sn(CCH)4, and triethynyltin iodide, ISn(CCH)3
Khaikin, L. S.,Belyakov, A. V.,Vilkov, L. V.,Bogoradovskii, E. T.,Zavgorodnii, V. S.
, p. 149 - 158 (1980)
The geometrical parameters of tetraethynyltin and triethynyltin iodide have been determined by gas-phase electron diffraction.Triethynyltin iodide was present as an admixture in both the tetraethynyltin samples studied.Because the samples differed significantly in percentage of the iodide (17.4 +/- 4.0 and 47.1 +/- 3.5 mol percent, in samples A and B, respectively), it was possible to determine the structures of both molecules to a sufficient degree of accuracy.The rα structures were solved by the least-squares treatment of the molecular intensites, using mean amplitudes and shrinkage corrections calculated from the force fields of a number of tin derivatives.The Td-symmetry model of Sn(CCH)4 was refined to give the following parameters: Sn-C, 2.068(5); CC, 1.228(8); CH, 1.079(51).The structural parameters for ISn(CCH)3 (on the basis of the C3V model with linear Sn-CC-H fragments) are as follows: Sn-I, 2.646(4); Sn-C, 2.062(17);, CC, 1.226(6); ISnC angle 108.0(2.8). (The thermal average bond distances, rg, are given in Angstroem, and the valence angle, rα, in degrees; the values in parentheses are three times the standard deviations, 3?).The Sn-C bonds in Sn(CCH)4 and ISn(CCH)3 are shorter than the corresponding bonds in the monoethynyltin derivatives, Me3SnCCH and Me3SnCCSnMe3.The SnI bond in ISn(CCH)3 is noticeably shorter than those in stannane iodide and trimethylstannane iodide.