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- W2022966440 abstract "Three pentaatomic molecules CSi2Al2, CSi2Ga2, and CGe2Al2 were studied at the B3LYP/6-311+G* and MP2/6-311+G* levels of theory (with tests also run at multiconfigurational levels) to determine whether the central carbon atom exists in a planar geometry. We found that cis-CSi2Al2 and trans-CSi2Al2 planar structures have one imaginary frequency and that distortion along this mode leads to slightly pyramidal local minima. In contrast, cis- and trans-CSi2Ga2 and cis- and trans-CGe2Al2 are true minima in their planar geometries, but their corresponding tetrahedral structures lie 25−28 kcal/mol higher in energy and are first-order saddle points on the respective energy surfaces. A molecular orbital analysis is presented to explain the preference of the planar anti-van't Hoff/Lebel structures over the corresponding tetrahedral structures. This analysis suggests that the presence of 18 valence electrons (which leads to three C−ligand σ bonds, one C−ligand π bond, and one ligand−ligand bond) is crucial for planar geometries to be stable and preferred over tetrahedral structures." @default.
- W2022966440 created "2016-06-24" @default.
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- W2022966440 date "1998-07-25" @default.
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- W2022966440 title "Tetracoordinated Planar Carbon in Pentaatomic Molecules" @default.
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- W2022966440 doi "https://doi.org/10.1021/ja981236u" @default.
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