Isocyanide and Phosphine Oxide Coordination in Binuclear
Chromium Pacman Complexes
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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, CNR
(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
