Spectroscopic investigation on proton transfer reaction in the complex of 2-aminopyridine with 2, 6-dichloro-4-nitrophenol in different solvents

被引：19

作者：

Al-Ahmary, Khairia M. ^{[2
]}

Habeeb, Moustafa M. ^{[1
]}

Al-Solmy, Eman A. ^{[2
]}

机构：

[1] Univ Alexandria, Dept Chem, Fac Educ, Alexandria, Egypt

[2] King Abdulaziz Univ, Fac Sci, Dept Chem, Jeddah, Saudi Arabia

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2011年 / 158卷 / 03期

关键词：

2-Aminopyridine; 2,6-Dichloro-4-nitrophenol; UV-Vis; FTIR; N-METHYLMORPHOLINE BETAINE; NMR; UV;

D O I：

10.1016/j.molliq.2010.11.012

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Proton transfer (PT) reaction between 2-aminopyridine (2AP) with 2,6-dichloro-4-nitrophenol (DCNP) has been investigated spectrophotometrically in methanol (MeOH), acetonitrile (AN) and acetonitrile with 1,2-dichloroethane binary mixtures (1:1, ANDEI) and (3:1, ANDEII). A long wavelength band in the range 395-424 nm due to the proton transfer complex formation has been recorded. The formation constants of the PT-reaction (K-PT.) have been estimated using Benesi-Hildebrand equation. It has been found that K-PT recorded larger value in AN than MeOH and binary mixtures. This result was interpreted in terms of solvatochromic parameters like, solvent polarizability (pi*), hydrogen bond donor (alpha), and hydrogen bond acceptor (beta). The molecular composition of the PT-complex has been identified by Job's and photometric titration methods where 1:1 complex is formed. Based on the rapidity and simplicity of the PT-reaction as well as the stability and simple composition of the formed complex, a rapid, accurate and sensitive spectrophotometric method for determination of 2AP was proposed. In addition, the solid FT-complex (2AP-DCNP) has been isolated and characterized using elemental analyses and FTIR measurements. (c) 2010 Elsevier B.V. All rights reserved.

引用

页码：161 / 165

页数：5

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