Attack of N-nucleophile on a coordinated carbonyl ligand: Structures of (7-azabenzonorbornadiene)tetracarbonyliron derivatives

Article abstract of DOI:10.1021/om00038a074

Three crystal structures of (N-substituted 7-azabenzonorbornadiene)Fe(CO)₄ derivatives have been studied for substituents 7-MeSO₂ (1), 7-p-ClC₆H₄ (2), and 7-p-MeC₆H₄ (3), respectively. In the solid state, an intramolecular interaction between the N-nucleophile and the nearby coordinated CO ligand is clearly seen. As the N?C=O contact distance becomes shorter, the O atom of Fe-C-O bends away from the N atom more, corresponding to a stronger interaction between the nucleophile and the coordinated CO.