EDA Complexes of 2,3-Dichloro-1,4-naphthoquinone with Some Substituted Anilines

Autor:	Abhay S. Kulkarni, M. L. Budni, Gururaj M. Neelgund
Rok vydání:	2004
Předmět:	Solvent chemistry.chemical_compound Chloroform Chemistry Stability constants of complexes Physical chemistry Organic chemistry General Chemistry 1 4-Naphthoquinone Stoichiometry Dichloromethane
Zdroj:	Monatshefte f�r Chemie / Chemical Monthly. 135:343-355
ISSN:	1434-4475 0026-9247
DOI:	10.1007/s00706-003-0128-8
Popis:	Electron donor-acceptor (EDA) complexes of several substituted anilines with the π-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.
Databáze:	OpenAIRE
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