Three new iridium (III) acetylacetonate complexes with an axial bipyridine ligand were synthesised via the direct reaction of [bis(acac-O,O′)(acac-C3)Ir(H2O)] and the corresponding bipyridine, and their molecular structures were determined by using single-crystal X-ray diffraction. The bipyridine used was di-2-pyridylketone, 2,2′-bipyridine and 2,2′-bipyridylamine, respectively. The results revealed that only mononuclear iridium complexes were obtained, although bipyridine has two N coordinate atoms, probably due to the great steric hindrance existing around the coordinate sphere if two bis(acac-O,O′)(acac-C3)Ir units were bridged by bipyridine. All these complexes are coordinated in one axial direction by bipyridine as a mono-dentate ligand in a slightly distorted octahedral coordination geometry.
Research on Chemical Intermediates – Springer Journals
Published: Jan 13, 2012
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