Abstract
In a comparative study, group VI tetracarbonyl complexes with 3,6-bis(2′-pyridyl)pyridazine (dppn) and 7,10-bis(2′-pyridyl)-8,9-diazafluoranthene (dpaf) have been synthesized and characterized by elemental analyses, IR, 1H NMR and electronic spectroscopy. The energy of the first MLCT electronic transition, for each ligand follows the order Mo>W>Cr, and shows that dpaf undergoes the stronger backbonding interaction. Hitherto, no other examples of 7,10-bis(2′-pyridyl)-8,9-diazafluoranthene transition metal complexes have been reported.
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