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• W1547955849 abstract "Abstract 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 %, in samples A and B, respectively), it was possible to determine the structures of both molecules to a sufficient degree of accuracy. The r α , structures were solved by the least-squares treatment of the molecular intensities, using mean amplitudes and shrinkage corrections calculated from the force fields of a number of tin derivatives. The T d -symmetry model of Sn(CCH) 4 was refined to give the following parameters: Sn-C, 2.068(5); CC, 1.228(8); CH, 1.079(51). The structural parameters for ISn(CCH) 3 (on the basis of the C 3v model with linear Sn-CC-H fragments) are as follows: Sn-I, 2.646(4); Sn-C, 2.062(17); CC, 1.226(6); ∠ISnC 108.0(2.8). (The thermal average bond distances, r g , are given in A, and the valence angle, rα, in degrees; the values in paren- theses are three times the standard deviations, 3σ.) The Sn-C bonds in Sn(CCH) 4 , and ISn(CCH) 3 are shorter than the corresponding bonds in the monoethynyltin derivatives, Me 3 SnCCH and Me 3 SnCCSnMe 3 . The SnI bond in ISn(CCH) 3 is noticeably shorter than those in stannane iodide and trimethylstannane iodide." @default.
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• W1547955849 date "1980-09-01" @default.
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• W1547955849 title "Molecular structures of acetylene derivatives of tin" @default.
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• W1547955849 doi "https://doi.org/10.1016/0022-2860(80)80167-0" @default.
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