Geometrical structures and vibrational frequencies of the energetically low-lying isomers of SiC3

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Abstract
The ground state of the SiC3 molecule is found to be a closed‐shell cyclic C 2v symmetry structure which can be described as a four‐membered ring with a transannular (cross ring) carbon–carbon bond, r(C–C)=1.469 Å. Theoretical studies with a triple‐zeta plus double‐polarization function (TZ2P) basis set in conjunction with the configuration‐interaction technique at the TZ2P self‐consistent‐field optimized geometries predict this rhomboidal structure to be 4.1 kcal/mol more stable than the linear triplet Si–C–C–C isomer. A second closed‐shell rhomboidal C 2v symmetry structure with carbon–silicon transannular bonding, r(Si–C)=1.880 Å, was located and characterized as a local minimum lying 4.3 kcal/mol above the ground‐state rhomboidal structure at this level of theory. Higher‐level theoretical methods, including contributions from triple excitations, with larger basis sets will be required to obtain a more definitive set of relative energies.

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