Spectroelectrochemical behaviour in dimethylformamide of pseudo-oxocarbons dianions derived from the croconate dianion

摘要: Abstract The electrochemical behaviour of croconate dianion and dicyanomethylene-substituted dianions was investigated in dimethylformamide containing tetrabutylammonium hexafluorophosphate at a Pt electrode. By cyclic voltammetry, the oxidation these involves two successive reversible monoelectronic transfers which yield corresponding radical-anions neutral species. reduction dianions, radical-trianions are characterized by uv-vis esr spectroscopies but unstable. redox potentials strongly dependent on number dicyanomethylene groups. Electrochemical kinetics parameters have been determinated. Among different states, only stable. Due to their high absorption uv-visible domain, spectroelectrochemical studies carried out characterize states. radical-anion/dianion couple is sufficiently cyclable for electromodulated colour changes may be used electrochromic applications.