Crystalline heaviest pnictogen-dipyrromethenes: isolation, characterization, and reactivity.

The heaviest pnictogen-dipyrromethenes DPMPnCl 2 (Pn = Sb, 3; Bi 4), which are direct analogues of boron-dipyrromethene (BODIPY), have been readily prepared and isolated as crystalline solids. Both compounds display green photoluminescence with small full widths at half maximum in toluene. Moreover, the reduction of 3 with sodium metal afforded the cyclic dicoordinate stibinidene 5.