Abstract
The macrocyclic complexone 1-oxa-4,7,10-triazacyclododecane- N, N′, N″-triacetic acid (cODTA) has been synthesized and its protona constants, stability constants of metal complexes and enthalpy changes for the formation of alkaline-earth complexes have been determined. Although it is not so powerful a complexing agent as the N-acetate derivative of the corresponding tetra-aza macrocycle, cDOTA, this is still one of the strongest complexones known, particularly towards the alkaline-earth metals. The complexes of the transition metals are also very stable and there is an inversion of the Irving—Williams order of stability for the complexes of cobalt and nickel.
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