The redox behavior of Cu(II) complexes has been investigated
by cyclic voltammetry (Table 5). The cyclic voltammograms of
the copper(II) complexes recorded at room temperature using
TBAP (tetrabutylammoniumperchlorate) as the supporting electrolyte
in the potential range 1.2 to 1.2 V reveal that the peak current
for the copper(II) complexes varies with the change of
Knoevenagel condensate of 3-(aryl)-pentane-2,4-dione. The free ligand
does not show oxidation or reduction peaks. The cathodic
current function values of copper complex were found to be independent
of the scan rate. The repeated scans as well as different
scan rates show that dissociation does not take place in the complex.
The Epa Epc values are greater than 200 mV, which indicates
that the reduction processes are irreversible [27] in nature and the
ratio of anodic to cathodic peak currents corresponding to the
chemical change occurs with the electron transfer as Cu(II)?
Cu(I)?Cu(0) (Fig. S5).