N-Heterocyclic Pincer Dicarbene Complexes of Iron(II):C-2 and C-5 Metalated Carbenes on the Same Metal Center

摘要

Six- and five-coordinate Fe(II) complexes with the pincer ligand 2,6-bis(imidazolylidene)pyridine(C-N-C),[(C-N-C)Fe(MeCN)_3][BPh_4]_2 and [(C-N-C)FeBr)2],respectively,were synthesized,Substitution of tmeda in [FeCl_2(tmeda0]_2 by C-N-C gave the sixcoordinate{[Fe(C-N-C)(C-N-C*)][FeCl_4]},in which one of the pincer ligands is bound to the metal via the 2-and 5-imidazole carbons.