Electrochemical reduction and oxidation of some photochromic compounds


Sarac A., Ustamehmetoglu B., LEIMINER A., STEPHAN B., MANNSCHRECK A.

ELECTROCHIMICA ACTA, vol.42, pp.3629-3635, 1997 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42
  • Publication Date: 1997
  • Doi Number: 10.1016/s0013-4686(97)00030-3
  • Journal Name: ELECTROCHIMICA ACTA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3629-3635
  • Keywords: photochromic compounds, electrochemistry of spirochromics, radical ions from spiro compounds, RADICAL IONS, EPR, ANIONS
  • Istanbul Technical University Affiliated: Yes

Abstract

The electrochemical oxidation and reduction of 11 spiro compounds have been investigated in ACN and DMF. The reversible voltammograms were obtained only for nitro and Cl substituted spiro compounds for reduction and oxidation, respectively. Oxidation potentials are more sensitive to the structural differences and the type of substituent than reduction potentials. The reduction potentials were in the range of -1.22 to -1.28 V vs see, which is in the range of reduction potentials expected for substituted nitro-benzenes. Semi-empirical quantum mechanical calculations carried out on MeO- and NO2-substituted chloro spirobenzopyrans focus on the determination of the enthalpies of the samples and comparison with the oxidation potentials of the same samples. (C) 1997 Elsevier Science Ltd.