Complexation of the macrocyclic hexa-amine ligand 1,4,7,10,13,16-hexa-azacyclo-octadecane(‘18-azacrown-6’)

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Abstract
Complexation constants in aqueous solutions of the title compound with various metal ions are presented, together with ΔH and ΔS parameters. Unlike lower polyamine macrocyclic homologues, it has appreciable affinity to non-polarizable cations.