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Zintl cluster supported low coordinate Rh(i) centers for catalytic H/D exchange between H2 and D2

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JournalChemical Science
DateAccepted/In press - 8 Jun 2022
DatePublished (current) - 9 Jun 2022
Volume13
Number of pages8
Pages (from-to)7626-7633
Original languageEnglish

Abstract

Ligand exchange reactions of [Rh(COD){η4-Ge9(Hyp)3}] with L-type nucleophiles such as PMe3, PPh3, IMe4 (IMe4 = 1,3,4,5-tetramethylimidazol-2-ylidene) or [W(Cp)2H2] result in the displacement of the COD ligand to afford clusters with coordinatively unsaturated trigonal pyramidal rhodium(i) centers [Rh(L){η3-Ge9(Hyp)3}]. These species can be readily protonated allowing access to cationic rhodium-hydride complexes, e.g. [RhH(PPh3){η3-Ge9(Hyp)3}]+. These clusters act as catalysts in H/D exchange between H2 and D2 and alkene isomerisation, thereby illustrating that metal-functionalized Zintl clusters are active in both H-H and C-H bond activation processes. The mechanism of H/D exchange was probed using parahydrogen induced polarization experiments.

Bibliographical note

Funding Information:
We thank Shell Global Solutions International B.V., the University of Oxford and the EPSRC for financial support of this research (Industrial CASE studentship O. P. E. T.; EP/M024210 ASW). The University of Oxford is also acknowledged for access to Chemical Crystallography facilities.

Publisher Copyright:
© 2022 The Royal Society of Chemistry

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