Abstract
Manganese (II), cobalt (II), nickel (II) and zinc (II) ions have been found to interact with the phenolic groups of L(−)adrenaline and L(−)noradrenaline. The stability constants of these 2:1 complexes have been measured at 25° and 0·1 M ionic strength in aqueous solution by means of a glass-calomel electrode system and the results compared with the similar complexes formed by catechol. Anomalous results obtained with the nickel-adrenaline system are explained on the basis of chelation through both the phenolic groups and the side chain. It is suggested that the formation of the 1:1 phenolic complex causes an increase in the base strength of the amino nitrogen.
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