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    STUDIA CHEMIA - Ediţia nr.1 din 2007  
         
  Articol:   GRAPHITE ELECTRODES MODIFIED WITH 3,7-DI(M-AMINOPHENYL)-10-ETHYL-PHENOTHIAZINE.

Autori:  VASILICA LATES, DELIA M. GLIGOR, LIANA MUREŞAN, IONEL CĂTĂLIN POPESCU, RADU GROPEANU, ION GROSU. 		 
       
         
  Rezumat:  The electrochemical behavior of a new functionalized phenothiazine derivative 3,7-di(m-aminophenyl)-10-ethyl-phenothiazine, adsorbed on spectrographic graphite, has been investigated. From cyclic voltammetric measurements, performed in aqueous buffer solutions of different pH values and at different potential scan rates, the rate constant of the heterogeneous electron transfer and the transfer coefficient were estimated. The electrochemical parameters of the voltammetric response and the slope of the linear regressions between the formal standard potentials and pH suggest a quasi-reversible 1e-/1H+ redox process, involving a surface confined redox couple. From the dependence of peak current on the cycling time, the electrochemical stability of the modified electrode was estimated. From cyclic voltammetry measurements performed at +150 mV vs. SCE, the electrocatalytic efficiency toward NADH oxidation was evaluated and it was found ~ 67 %, recommending the new synthesized compound as a promising mediator for NADH electrocatalytic oxidation.  
         
     
         
         
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