Spectroscopic and Thermodynamic Studies on Charge Transfer Complex Formation between 2-Aminopyridine and 2,5-Dihydroxy-<Emphasis Type="Italic">p</Emphasis>-benzoquinone |
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Authors: | Khairia M Al-Ahmary Moustafa M Habeeb Eman A Al-Solmy |
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Institution: | (1) Department of Chemistry, The University of Burdwan, Golapbag, Burdwan, 713 104, India;(2) Department of Chemistry, Heritage Institute of Technology, Anandapur, Kolkata, 700 017, West Bengal, India; |
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Abstract: | Charge transfer complex formation between 2-aminopyridine (2AP) as the electron donor with 2,5-dihydroxy-p-benzoquinone (AHBQ) as the π-electron acceptor has been investigated spectrophotometrically in acetonitrile (AN) and 50% acetonitrile + 50% 1,2-dichloroethane
(V/V), (ANDC). The stoichiometry of the complex has been identified by Job’s method to be 1:1. The Benesi-Hildebrand equation
has been applied to estimate the formation constant (K
CT) and molecular extinction coefficient (ε). It was found that the value of K
CT is larger in ANDC than in AN. The thermodynamic parameters are in agreement with the K
CT values in that the enthalpy of formation (−ΔH) has a larger value in ANDC than in AN, suggesting higher stability of the complex in ANDC. The complex formed between 2AP
and DHBQ has been isolated as a solid and characterized using elemental analysis, FTIR, and 1H NMR measurements. Moreover, it has been found that the formed complex involves proton transfer in addition to charge transfer. |
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