European Journal of Chemistry 2014, 5(1), 41-52 | doi: https://doi.org/10.5155/eurjchem.5.1.41-52.825 | Get rights and content






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Spectrophotometric studies on some arylazo diamino pyrimidinol in organic solvents and in buffer solutions


Nadia Ahmed Abdalla (1,*) , Mohamed Tawfek El-Haty (2) , Farok Abd-Elkarim Adam (3) , Fatma Wafdy Hassan (4)

(1) Chemistry Department, Aswan Faculty of Science, Aswan University, 81528, Aswan, Egypt
(2) Chemistry Department, Aswan Faculty of Science, Aswan University, 81528, Aswan, Egypt
(3) Chemistry Department, Aswan Faculty of Science, Aswan University, 81528, Aswan, Egypt
(4) Chemistry Department, Aswan Faculty of Science, Aswan University, 81528, Aswan, Egypt
(*) Corresponding Author

Received: 09 May 2013 | Revised: 06 Jul 2013 | Accepted: 26 Jul 2013 | Published: 31 Mar 2014 | Issue Date: March 2014

Abstract


The spectral behavior of some new arylazo-2,6-diamino-4-pyrimidinol in pure and mixed organic solvents and buffer solutions of varying pH have been studied. The observed bands are assigned to the possible electronic transition. The band appearing in the visible region is assigned to p→p* transition involving p-electronic system of the whole compounds, associated with intramolecular charge transfer. This charge transfer seems to originate from the aryl moiety to the pyrimidine ring which is characterized by accepting character. This behavior can be explained that these compounds exist in the hydroxyazo-quinoid hydrazon tautomreic explained equilibrium. The possibility of the formation of a-H-bond solvated molecular complex between the molecule of azo 2,6-diaminopyrimidinol and proton-acceptor solvents of DMSO and DMF molecular were discussed. The pK values of these compounds were determined and on the basis of the relative contribution of acidic basic character of respective species.


Keywords


pK values; Mixed solvents; Buffer solutions; Spectra behavior; Molecular complex; Arylazo diaminopyrimidinol

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DOI: 10.5155/eurjchem.5.1.41-52.825

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Department of Chemistry, Aswan Faculty of Science, Aswan University, Aswan, Egypt

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How to cite


Abdalla, N.; El-Haty, M.; Adam, F.; Hassan, F. Eur. J. Chem. 2014, 5(1), 41-52. doi:10.5155/eurjchem.5.1.41-52.825
Abdalla, N.; El-Haty, M.; Adam, F.; Hassan, F. Spectrophotometric studies on some arylazo diamino pyrimidinol in organic solvents and in buffer solutions. Eur. J. Chem. 2014, 5(1), 41-52. doi:10.5155/eurjchem.5.1.41-52.825
Abdalla, N., El-Haty, M., Adam, F., & Hassan, F. (2014). Spectrophotometric studies on some arylazo diamino pyrimidinol in organic solvents and in buffer solutions. European Journal of Chemistry, 5(1), 41-52. doi:10.5155/eurjchem.5.1.41-52.825
Abdalla, Nadia, Mohamed Tawfek El-Haty, Farok Abd-Elkarim Adam, & Fatma Wafdy Hassan. "Spectrophotometric studies on some arylazo diamino pyrimidinol in organic solvents and in buffer solutions." European Journal of Chemistry [Online], 5.1 (2014): 41-52. Web. 31 May. 2020
Abdalla, Nadia, El-Haty, Mohamed, Adam, Farok, AND Hassan, Fatma. "Spectrophotometric studies on some arylazo diamino pyrimidinol in organic solvents and in buffer solutions" European Journal of Chemistry [Online], Volume 5 Number 1 (31 March 2014)

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