Isocyanide and Phosphine Oxide Coordination in Binuclear Chromium Pacman Complexes

Abstract

The new binuclear chromium Pacman complex [Cr<sub>2</sub>(L)] of the Schiff base pyrrole macrocycle H<sub>4</sub>L has been synthesized and structurally characterized. Addition of isocyanide, CNR (R = xylyl, <sup>t</sup>Bu), or triphenylphosphine oxide donors to [Cr<sub>2</sub>(L)] gives contrasting chemistry with the formation of the new coordination compounds [Cr<sub>2</sub>(μ-CNR)­(L)], in which the isocyanides bridge the two Cr­(II) centers, and [Cr<sub>2</sub>(OPPh<sub>3</sub>)<sub>2</sub>(L)], a Cr­(II) phosphine oxide adduct with the ligands exogenous to the cleft

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