415901-48-3Relevant academic research and scientific papers
Synthesis and structure of group 14 element derivatives of carbotelluroates
Tani, Kazuyasu,Yamada, Ryo,Kanda, Takahiro,Suzuki, Masahiro,Kato, Shinzi,Murai, Toshiaki
, p. 1487 - 1492 (2002)
Group 14 element derivatives of carbotelluroates, RCOTeMPh3 (M = Ge, Sn, Pb), were synthesized as stable compounds by reacting sodium carbotelluroates with Ph3MCL and were characterized by IR and 13C and 125Te NMR spectra. Their molecular structures were revealed by X-ray molecular analysis. The C=O?Sn distance in RCOTeSnPh3 was found to be shorter than the C=O?Ge distance in RCOTeGePh3, despite the fact that the atomic radius of Sn is larger than that of Ge. A similar shortening of the nonbonding distance was observed for the corresponding selenium derivatives. Molecular orbital calculations of model compounds, i.e., CH3COEM(CH3)3 (E = Se, Te; M = Ge, Sn, Pb), at the B3LYP/LANL2DZ+p level also supported this shortening of the C=O?Sn distance. NBO (natural bond orbital) analyses of the model compounds showed that two types of orbital interactions, no →σ *ME and no→σ *MC (E = S, Se, Te; M = Ge, Sn, Pb), are important in these carbochalcogenoates. Furthermore, the former interaction has a greater role in the case of carbothioates, whereas the latter is dominant in carbotelluroates.
