Molecular N_2 complexes of iron stabilised by N-heterocyclic 'pincer' dicarbene ligands

摘要

The first N_2 complex stabilised by N-heterocyclic carbene ligands,Fe(C-N-C)(N_2)_2,has been obtained by the reduction of Fe(C-N-C)Br_2 where C-N-C = 2,6-bis(aryl-imidazol-2-ylidene)pyridine,aryl = 2,6-Pr~i_2C_6H_3,with Na(Hg);it serves as a convenient precursor for other iron NHC 'pincer' complexes of the type Fe(C-N-C)(N_2)L where L = C_2H_4,PMe_3 and Fe(C-N-C)(CO)_2.