BiZness as usual? Not exactly! The bismuth atom of the tridentate diphosphinobismuthine (o-(Ph2P)C6H4)2BiCl behaves as a Z rather than L ligand when in the coordination sphere of late transition metals such as gold. The σ-acceptor behavior of Bi is supported by its disphenoid coordination geometry and theoretical studies, which show a Au→Bi interaction.
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