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Semnani, A., Firooz, A., Pouretedal, H., Nazari, B. (2004). Spectrophotometric Study of the Intreaction of some Benzo, Benzyl and Phnylcrown Ethers with Pi-Acceptor DDQ in Chloroform Solution. Iranian Journal of Chemistry and Chemical Engineering (IJCCE), 23(1), 57-64.
Abolfazl Semnani; Ali Reza Firooz; Hamid Reza Pouretedal; Behzad Nazari. "Spectrophotometric Study of the Intreaction of some Benzo, Benzyl and Phnylcrown Ethers with Pi-Acceptor DDQ in Chloroform Solution". Iranian Journal of Chemistry and Chemical Engineering (IJCCE), 23, 1, 2004, 57-64.
Semnani, A., Firooz, A., Pouretedal, H., Nazari, B. (2004). 'Spectrophotometric Study of the Intreaction of some Benzo, Benzyl and Phnylcrown Ethers with Pi-Acceptor DDQ in Chloroform Solution', Iranian Journal of Chemistry and Chemical Engineering (IJCCE), 23(1), pp. 57-64.
Semnani, A., Firooz, A., Pouretedal, H., Nazari, B. Spectrophotometric Study of the Intreaction of some Benzo, Benzyl and Phnylcrown Ethers with Pi-Acceptor DDQ in Chloroform Solution. Iranian Journal of Chemistry and Chemical Engineering (IJCCE), 2004; 23(1): 57-64.

Spectrophotometric Study of the Intreaction of some Benzo, Benzyl and Phnylcrown Ethers with Pi-Acceptor DDQ in Chloroform Solution

Article 7, Volume 23, Issue 1, March and April 2004, Page 57-64  XML PDF (283 K)
Document Type: Research Article
Authors
Abolfazl Semnani 1; Ali Reza Firooz1; Hamid Reza Pouretedal2; Behzad Nazari2
1Department of Chemistry, Shahrekord University, P. O. Box 115, Shahrekord, I.R. IRAN
2Department of Chemistry, Malek-Ashtar University of Technology, Shahinshahr, I.R. IRAN
Abstract
The interaction between benzo-15-crown-5 (B15C5), dibenzo-18-crown-6 (DB18C6), dibenzyl-daza-18crown-6 (DBzDA18C6), N-phenyl-aza-15-crown-5 (NPhA15C5) and dibenzopyridine-18-crown-6 (DBPy18C6) with π-acceptor 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) in chloroform solution was studied spectrophotometrically. The interaction of B15C5-DDQ and DB18C6-DDQ caused the formation of 1:1 charge transfer complexes through equilibrium reaction. The interaction of others caused the formation of 1:1 complexes in an equilibrium step and the conversion of the resulting adduct to D+DDQ- (D=NPhA15C5, DBPy18C6, DBzDA18C6) in a nonequilibrium step. The formation constant of DBzDA18C6 was evaluated by computer fitting of the absorbance mole ratio data. Other stability constants were evaluated through the Hildebrand method. It was found that the stabilities vary in the order: B15C5 < DB18C6 < DBPy18C6 < NPhA15C5 < DBzDA18C6. All of the resulting molecular complexes were isolated in crystalline form and characterized.
Keywords
DDQ; Crown Ethers; Spectrophotometry; Charge transfer complex
Main Subjects
Applied Chemistry; Organic Chemistry
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