Add time:08/12/2019         Source:sciencedirect.com

The reactions of 1,4-di-(N-methyl-2′-pyrrolyl)-2,3-diaza-1,3-butadiene (1), 1,4-di-(6-methyl-2′-pyridyl)-2,3-diaza-1,3-butadiene (2) and 3,6-di-(2′-thienyl)-1,2,4,5-tetrazine (3) with Fe2(CO)9 in toluene, THF and benzene, respectively, yielded various types of hexacarbonyldiiron complexes with five different coordination modes: (1) a complex with two 2-pyrrolylmethylideneamido bridging ligands, 1a, which resulted from NN bond cleavage of ligand 1, (2) a cyclometallated (μ-2,3-η1:η2-pyrrolyl; η1:η1(N)) complex 1b and a cyclometallated (μ-2,3-η1:η2-thienyl; η1:η1(N)) complex 3b, (3) a diaza-bridged complex 3a, (4) an imine-bridged (μ-σ;π-η1:η2-(C,N); η1(Npy)) complex 2a and (5) an imine-bridged (μ-π-η1:η1-(C,N);η1(Npy);η1(Npy′)) complex 2b. The molecular structures of the ligands 1 and 3 as well as of the complexes 1a, 2a and 3a have been determined by single-crystal X-ray crystallography.

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