The dichromium Pacman complex (dmx)CrCl·CHO (1) [(dmx)H is a dimethylxanthene-bridged cofacial (bis)dipyrrin, CHNO] was synthesized by salt metathesis using anhydrous CrCl and previously reported (dmx)K. Treatment of 1 with two equivalents of the reductant potassium graphite afforded K(dmx)CrCl(thf)·0.5CHO·0.5CHO (thf is tetrahydrofuran, CHO) (2), with both potassium ions intercalated between the pyrrolic subunits. Comparison of the solid-state structures for 1 and 2 reveals minimal changes in the primary coordination sphere of each Cr ion, with notable elongation of the dipyrrin C-C and C-N bonds upon reduction, consistent with computational support for a ligand-based reduction.
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