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