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Electronic Communication in Binuclear Osmium- and Iridium-Polyhydrides.


ABSTRACT: Reactions of polyhydrides OsH6(PiPr3)2 (1) and IrH5(PiPr3)2 (2) with rollover cyclometalated hydride complexes have been investigated in order to explore the influence of a metal center on the MHn unit of the other in mixed valence binuclear polyhydrides. Hexahydride 1 activates an ortho-CH bond of the heterocyclic moiety of the trihydride metal-ligand compounds OsH32-C,N-[C5RH2N-py]}(PiPr3)2 (R = H (3), Me (4), Ph (5)). Reactions of 3 and 4 lead to the hexahydrides (PiPr3)2H3Os{μ-[κ2-C,N-[C5RH2N-C5H3N]-N,C2]}OsH3(PiPr3)2 (R = H (6), Me (7)), whereas 5 gives the pentahydride (PiPr3)2H3Os{μ-[κ2-C,N-[C5H3N-C5(C6H4)H2N]-C,N,C3]}OsH2(PiPr3)2 (8). Pentahydride 2 promotes C-H bond activation of 3 and the iridium-dihydride IrH22-C,N-[C5H3N-py]}(PiPr3)2 (9) to afford the heterobinuclear pentahydride (PiPr3)2H3Os{μ-[κ2-C,N-[C5H3N-C5H3N]-N,C2]}IrH2(PiPr3)2 (10) and the homobinuclear tetrahydride (PiPr3)2H2Ir{μ-[κ2-C,N-[C5H3N-C5H3N]-N,C2]}IrH2(PiPr3)2 (11), respectively. Complexes 6-8 and 11 display HOMO delocalization throughout the metal-heterocycle-metal skeleton. Their sequential oxidation generates mono- and diradicals, which exhibit intervalence charge transfer transitions. This notable ability allows the tuning of the strength of the hydrogen-hydrogen and metal-hydrogen interactions within the MHn units.

SUBMITTER: Cancela L 

PROVIDER: S-EPMC9179948 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Electronic Communication in Binuclear Osmium- and Iridium-Polyhydrides.

Cancela Lara L   Esteruelas Miguel A MA   Galbán Javier J   Oliván Montserrat M   Oñate Enrique E   Vélez Andrea A   Vidal Juan C JC  

Inorganic chemistry 20210205 4


Reactions of polyhydrides OsH<sub>6</sub>(P<sup>i</sup>Pr<sub>3</sub>)<sub>2</sub> (<b>1</b>) and IrH<sub>5</sub>(P<sup>i</sup>Pr<sub>3</sub>)<sub>2</sub> (<b>2</b>) with rollover cyclometalated hydride complexes have been investigated in order to explore the influence of a metal center on the MH<sub><i>n</i></sub> unit of the other in mixed valence binuclear polyhydrides. Hexahydride <b>1</b> activates an <i>ortho</i>-CH bond of the heterocyclic moiety of the trihydride metal-ligand compounds O  ...[more]

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