MCSCF calculations followed by large scale configuration interaction, comparable with the best done for isovalent methylene, give a singlet–triplet splitting in silylene of 21.0±1 kcal/mol. The singlet is the lower energy state. Structural parameters for the as yet unobserved triplet are re =1.48±0.005 Å and θe =118.5±1°.
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Balasubramanian et al. (1986) studied this question.
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