Polyazamacrocycles VIII. Polarographic behaviour of some tetraaza macrocyclic complexes of copper(II), nickel(II) and cobalt(III)

Abstract

The polarographic reduction at a dropping mercury electrode of several CuII, NiII and CoIII complexes of tetraaza macrocycles has been studied in 0.1M NaClO4 as supporting electrolyte. The CuII complexes show values of half-wave potentials which can be correlated to the ring size and ligand field stabilisation. A similar, though less marked, trend is noticeable in the reduction of the NiII complexes. No such conclusions can be drawn in the case of the CoIII complexes.