synthesis, acidity constants and tautomeric structure of the diazonium coupling products of 2-(benzylsulfanyl)-7h-purin-6-one in its ground and excited states重氮化合物的合成、酸度常量和互变异构的结构耦合的产物2 -(benzylsulfanyl)7 h-purin-6-one地面和激发态.pdfVIP

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synthesis, acidity constants and tautomeric structure of the diazonium coupling products of 2-(benzylsulfanyl)-7h-purin-6-one in its ground and excited states重氮化合物的合成、酸度常量和互变异构的结构耦合的产物2 -(benzylsulfanyl)7 h-purin-6-one地面和激发态.pdf

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synthesis, acidity constants and tautomeric structure of the diazonium coupling products of 2-(benzylsulfanyl)-7h-purin-6-one in its ground and excited states重氮化合物的合成、酸度常量和互变异构的结构耦合的产物2 -(benzylsulfanyl)7 h-purin-6-one地面和激发态

Molecules 2011, 16, 8788-8802; doi:10.3390/molecule OPEN ACCESS molecules ISSN 1420-3049 /journal/molecules Article Synthesis, Acidity Constants and Tautomeric Structure of the Diazonium Coupling Products of 2-(Benzylsulfanyl)-7H-purin-6- one in Its Ground and Excited States Elham S. Darwish 1,*, Mosselhi A. Mosselhi 2, Farag M. Altalbawy 3 and Hosam A. Saad 2 1 Department of Chemistry, Faculty of Science, University of Cairo, Giza, 12613, Egypt 2 Department of Chemistry, Faculty of Science, University of Taif, Taif, 888, Saudi Arabia; E-Mails: mosselhi2008@ (M.A.M.); h_saadzag@ (H.A.S.) 3 National Institute of Laser-enhanced Sciences, University of Cairo, Giza, 12613, Egypt; E-Mail: f_altalbawy@ * Author to whom correspondence should be addressed; E-Mail: elham_darwish@. Received: 22 September 2011; in revised form: 7 October 2011 / Accepted: 12 October 2011 / Published: 19 October 2011 Abstract: A series of new 8-arylhydrazono-2-(benzylsulfanyl)-7H-purin-6-ones 6 were synthesized, their electronic absorption spectra in different organic solvents of varying polarities were investigated and their acid dissociation constants in both the ground and excited states were determined spectrophotometrically. The tautomeric structures of such products were elucidated by spectral analyses and correlation of their acid dissociation constants with the Hammett equation. The results indicated that the studied compounds 6 exist pred