EDA Complexes of 2,3-Dichloro-1,4-naphthoquinone with Some Substituted Anilines |
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Authors: | Gururaj M. Neelgund Abhay S. Kulkarni M. L. Budni |
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Affiliation: | (1) Universidade Estadual Paulista J?lio de Mesquita Filho, Campus Sorocaba, Av. Tr?s de Mar?o, 511, 18087-180 Sorocaba, S?o Paulo, Brazil;(2) Departamento de Bioqu?mica, Instituto de Biologia, Unicamp, Cidade Universit?ria Zeferino Vaz, s/n, Campinas, SP, Brazil;(3) Universidade Federal do ABC, Santo Andr?, SP, Brazil;(4) Faculdade de Ci?ncias Farmac?uticas, Universidade de S?o Paulo, S?o Paulo, SP, Brazil;(5) Universidade Federal de Lavras, Campus Universit?rio da UFLA, Lavras, MG, Brazil; |
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Abstract: | Electron donor-acceptor (EDA) complexes of several substituted anilines with the -acceptor 2,3-dichloro-1,4-naphthoquinone (DClNQ) in chloroform, dichloromethane, and 1,2-dichloroethane were studied by a spectrophotometric method. Experimental data has been shown to confirm the 1:2 stoichiometry of the acceptor-donor in spite of the apparent linearity of the Benesi-Hildebrand plot for a 1:1 complex. The calculated values of oscillator strengths, transition moments, and thermodynamic parameters confirms the 1:2 (A:D) stoichiometry of the complexes. The formation constants and molar absorptivities for these AD2 complexes have been evaluated. The stoichiometry was unaffected by the variation of the temperature over a small interval and also by the change in polarity of the solvent. The order of the donor strength followed the sequence: N-benzylaniline>p-chloroaniline>m-chloroaniline>o-chloroaniline. |
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