[摘要]：Treating [M{eta(5)-1,2-C(5)H(3)(COC(4)H(3)O)(2)}(CO)(3)] (3) (M = Mn, 3A, M = Re, 3B) with excess hydrazine hydrate in methanol afforded the desired 5,6-fused ring pyridazine complexes, [M(CO)(3){eta(5)-1,2-C(5)H(3)(CC(4)H(3)ON)(CC(4)H(3)ON)}] (4) (M = Mn, 4A, M = Re, 48), in high yield (76%). However, when X-ray crystallographic analysis of the pyridazyl complexes 4A and 4B was attempted, all recrystallization trials led to ligand loss to the 1,2-difurylpyridazine, 1,2-C(5)H(3)(CC(4)H(3)ONH)(CC(4)H(3)ON) (5). Compound 5 was observed to have a coplanar stacking arrangement in the solid state along the crystallographic b axis. Theoretical calculations performed on compound 5 indicate a high degree of intramolecular electronic delocalization as well intermolecular orbital interaction.
