In-plane or out-of-plane: Two low-energy states of the phenylthiyl radical were observed in the photodissociation of [D1]thiophenol. The relative orientation of the singly occupied molecular orbital (SOMO) distinguishes the two species, namely X̃(B1) and Ã(B2). This orbital is largely localized on the sulfur atom and exhibits atomic-orbital-like alignment with respect to the molecular plane (see picture).
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Lim et al. (2006) studied this question.
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