Synthesis and Copper(I) Complexes of a Series of 9‐ to 13‐Membered N₃ Macrocycles

Abstract

Abstract Eight cyclic triamines with ring sizes between 9 and 13 were synthesized by the p ‐toluenesulfonate method. The open‐chain triamines bis(2‐aminoethyl)amine (dien) and bis(3‐aminopropyl)amine (diprop) were used as starting materials. In some cases, the corresponding dimeric cyclic hexaamines have been isolated and characterized as major by‐products. The complexation of Cu(I) by the triamines has been studied potentiometrically in CH 3 CN/H 2 O. All ligands L form ternary complexes [Cu(CH 3 CN)L] + . The corresponding association constants vary between 10 11 and 10 7 , decreasing with increasing ring size. In addition, complexes [Cu(CH 3 CN) y LH] 2+ , y = 1 or 2, are found as less important species with maximum concentrations of 7 to 50%.