Electrochemical study of the stability of the electron-donor—acceptor (EDA) complex between N,N,N′,N′-tetramethyl-p-phenylendiamine and m-dinitrobenzene in acetonitrile

✍ Scribed by M.A. Zon; H. Fernández; L. Sereno; J.J. Silber

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 751 KB
• Volume: 32
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(87)87011-1

✦ Synopsis

The stability constant of the EDA complex between N,Ar,N',N'-tetramethyl-p-phenylendiamine and m-dinitrobenzene in acetonitrile has been studied by cyclic voltammetry and potentiometric titration at constant finite current. For comparison, spectral measurements were made. The spectroscopic techniques allowed us to assume the formation of a 1: 1 EDA complex of which stability in acetonitrile is lower than that previously reported in chloroform This solvent effect is expected for such weak complexes. The electrochemical techniques give a higher value of the stability constant in similar conditions. The possible causes of the discreoancies are discussed. However. the enthalov and entronv values for the nrocess closelv agree in both elect&chemical and spectroscopic methods. ss is good ev&nce that both khniques are accounting for the same type of interaction. The electrochemical techniques, and particularly cyclic voltammetry, seem to be fast and sensible methods to study EDA complex interactions in polar aprotic solvents.