A dinuclear Cu II complex containing a hexaaza macrocyclic ligand bearing two 2-hydroxypropyl pendants, 3,6,9,16,19,22-hexaaza-6,19-bis(2-hydroxypropyl) . The protonation constants of Cu 2 L were determined by potentiometric titration, and it was found that the alcoholic hydroxypropyl group of the complex Cu 2 L exhibits low pK a values of pK a1 = 7.31, pK a2 = 7.83 at 25°C. The hydrolysis kinetics of 4-nitrophenyl acetate (NA) promoted by the title
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