Journal of Structural Chemistry

, Volume 55, Issue 1, pp 23–29 | Cite as

A quantum chemical study of the structure of dodecasilsequioxane H12Si12O18

  • S. G. Semenov
  • M. E. Bedrina


Quantum chemical B3LYP/cc-pVTZ, PBE0/cc-pVTZ, and MP2(full)/6-311G(d,p) methods are used to calculate the structural parameters of dodecasilsequioxane H12Si12O18 and the H12Si12O 18 + cation. According to DFT/cc-pVTZ calculations the energy of H12Si12O18 (D 6h ) is 1.3–1.7 kcal/mol higher than the energy of H12Si12O18 (D 2d ). A reduction of the basis set results in a greater energy difference of H12Si12O18 isomers. For the cation 2 B 2u and 2 B 1 electronic states are obtained, which correspond to symmetric equilibrium structures H12Si12O 18 + (D 6h ) and (D 2) respectively. For the He@H12Si12O18 endocomplex the D 2d symmetry is obtained; for He2@H12Si12O18 the D 2h symmetry; and for H2@H12Si12O18 the D 6h symmetry.


dodecasilsequioxane endocomplexes symmetry structure ionization B3LYP PBE0 MP2(full) cc-pVTZ 


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© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  1. 1.St. Petersburg State UniversitySt. PetersburgRussia

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