Iron carbonyl complexes bearing phenazine and acridine ligands: X-ray structures of Fe(CO)3(η4-C12H8N2), Fe(CO)2{P(OMe)3}(η4-C12H8N2), Fe(CO)2(PPh3) (η4-C13H9N), and Fe(CO)2(κ1-dppm) (η4-C12H8N2)

Abstract

Reactions of Fe 3 (CO) 12 with the heterocycles phenazine and acridine in refluxing benzene afforded the mononuclear complexes Fe(CO) 3 ((4b). Compounds 1a, 2a, 3b, and 4a have been structurally characterized by X-ray crystallography. The ancillary phenazine and acridine ligands in these products adopt an η 4coordination mode by using only the peripheral carbon atoms in one of the carbocyclic rings.Given the rarity of this coordination mode in metal carbonyl complexes, we have performed electronic structure calculations on 1a and these data are discussed relative to the solid-state structure.