Abstract
Tris(3-phenyl-2,4-pentanediono)cobalt(III) has been treated with three kinds of bromination reagents; bromine in the presence of pyridine, pyridine perbromide, and N-bromosuccinimide. Components of the product species have been detected by means of thinlayer chromatography and fractionated by liquid-chromatography. The characterization of bromination products has been performed by the aid of infrared and nuclear magnetic resonance spectroscopy. The bromination has taken place with the chelate ring remaining intact, and converted methyl groups in the coordinated ligands to bromomethyl. The cleavage of coordinate bonds, which has occurred afterward, has resulted in the formation of a metal-absent brominated ligand. Among various bromination products, the one with lowest bromination degree (monobrominated chelate) has been fully characterized in accordance with the experimental facts: elemental analysis, the appearance of a new infrared band at 1248 cm−1 which is attributable to CH2 wagging vibration of the ...
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