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    STUDIA CHEMIA - Issue no. 2 / 2006  
         
  Article:   VOLTAMPEROMETRIC DATA ON THE BIOLOGICAL ACTIVE SYSTEMS CU(II), PD(II) AND NI(II) – SALICYLIC ALDEHIDE THIOSEMICARBAZONE.

Authors:  MARIA JITARU, MARIA BIRCA, MIHAELA HURDUCAS. 		 
       
         
  Abstract:  The voltamperometric behavior of the systems Cu(II), Ni(II) and Pd(II) – thiosemicabazone of salicylic aldehyde (TSCSA) has been investigated on glassy carbon electrodes (cyclic voltametry) in DMF/LiClO4 0,2 M medium, using computer aided electrochemical systems BAS 100W and AUTOLAB – ECOCHEMIE. In the case of all complexes can be seen that the peak related with the sulphur oxidation was moved towards positive higher values, which confirm the involving of sulphur in the coordination. From the point of view of the donor – acceptor interaction between metallic ion and sulphur atom as donor, it can be affirmed that, in these conditions, the Cu(II) complex is more stable than the Ni(II) and Pd(II) complexes. This conclusion is in accordance with the especial affinity of the Cu(II) ion against sulphur. Based on the shifts of reduction potentials of the metals, ΔЄ = 215 mV for Cu complex, ΔЄ = 162 mV for Ni complex and ΔЄ = 180 mV for Pd complex, various degrees of interaction have been identified. They are qualitatively correlated with the stability of the complexes.  
         
     
         
         
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