Electron spin resonance and visible-u.v. spectroscopic study of the charge-transfer complexes between chloronaphthazarin derivatives and DMSO

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Abstract

The charge-transfer (CT) complexes between five chloronaphthazarin derivatives and DMSO (dimethylsulphoxide) are studied by electron spin resonance and vis.-u.v. spectroscopy. The compounds studied are 2-chloro-(1), 2,6-dichloro-(2), 2,7-dichloro-(3), 2,3,6-trichloro-(4) and tetrachloronaphthazarin (5). The radical anions are obtained by ionization of the corresponding CT complexes. The same donor molecule (DMSO) is used as ionizing solvent. The absorption CT bands are obtained using CHCl3 as solvent. Values are given for the hyperfine splittings and g factors of the radical anions, together with the λmax and ϵ of the electronic transitions of 1–5 and the corresponding λmax of the CT bands. The importance of the previous cyclic voltammetry when the radical anions or cations of quinones with electron withdrawing groups are obtained by electrolysis is emphasized.

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