Abstract
A distinct change in the absorption characteristics of the hexaaza macrocycle 1 is observed upon complexation of alkali- and alkaline-earth-metal ions. This effect, which is due to the tautomerization of the hydrazone form (left) to the azine form (right) during complexation, is especially pronounced for complexes of Li, Mg, and Ca. 1 is thus targeted as a possible component of ion-selective optical sensors.
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