RHF/6-31G(d) and MP2/6-31G(d) calculations were carried out to study the stereoelectronic structure of 1-(1-trichlorogermylethyl)pyrrolidin-2-one with a pentacoordinated germanium atom. These results were compared with the X-ray diffraction structural analysis data. Upon formation of the Ge ← O coordination bond in this molecule, the electron density of all the atoms of the coordination polyhedron of the germanium atom, including the oxygen atom, increases, especially the axial chlorine atom, while the electron density of the germanium, nitrogen, and carbonyl group carbon atoms decreases. Different polarization of all three valence p-orbitals of each Cl atom of this molecule was established. 35Cl nuclear quadrupole resonance spectrum parameters were evaluated. The molecule also has stable form, in which the germanium atom is tetracoordinated. The total energy of this form is 2.7 kcal/mol higher than for the structure with a pentacoordinated germanium atom.
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*Dedicated to Academician M. G. Voronkov on his 90th birthday.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1661-1667, November, 2011.
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Feshin, V.P., Feshina, E.V. ab initio Calculation of the stereoelectronic structure of 1-(1-trichlorogermylethyl)-pyrrolidin-2-one*. Chem Heterocycl Comp 47, 1378–1383 (2012). https://doi.org/10.1007/s10593-012-0924-3
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DOI: https://doi.org/10.1007/s10593-012-0924-3