چكيده فارسي :
Schiff-base ligands and their complexes are of attention for chemists due to their structural and spectroscopic properties [1]. Study of electrochemical behavior of a compound can be important in various aspects and also may be lead to some structural information and even chemical and biochemical activity [2]. In the present paper, new Zn (II) Schiff base complex derived from 1, 3-phenylenediamine and 4-dimethylaminobenzaldehyde (Scheme 1) was prepared in 1:2 ratio and studied by CHNS analysis, FT-IR and UV-Vis spectroscopy. Furthermore, the redox potentials of complex were studied by cyclic voltammetry technique in MeCN solution at a scan rate of 100 mV/s. The CHNS analysis results were in full concurrence with the empirical formulae. Evidence of coordination of metal ion to azomethine nitrogen has been based on shifting of the C=N band to the the free ligand from higher to lower wavenumber in the spectra of the complex. The UV-Vis spectrum of ligand showed three bands at 214, 238 and 364 nm. The former two bands are due to the π-π* transitions within the aromatic ring and the third band is due to the n-π* transitions of azomethine group and also observed in the spectra of complex with a shift to lower wavelength indicating coordination of the ligand to metal centre. A cyclic voltammogram of Zn (II) complex presented in Fig.1. The Zn (II) complex undergoes reduction at cathodic potentials. The complex showed reduction at the potential of - 0.80 V (Epc) and the reduction process is found to be irreversible in nature.
