Synthesis reveals thermal instability and H2 formation in organobismuth dihydride, suggesting novel properties for organometallics.
We report the synthesis, isolation, and structural characterization of an elusive organobismuth(III) dihydride (Ar*-Bi(III)-H2, 1). The complex features a bulky and rigid tBu-MsFluind ligand that permits complete spectroscopic characterization and SC-XRD. The compound is thermally unstable and decomposes to quantitatively form H2 and Ar*-Bi(I) in a chemoselective intramolecular process. In addition to H2 formation, the presence of a Bi-H bond is supported by comparative spectroscopy (NMR and IR) with its deuterated analogue 1-d2.
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Kurumada et al. (2025) studied this question.