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<p>Synthesis of a new heterocyclic dye compound as an indicator in acid and base reactions</p><p> </p>

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Title Statement <p>Synthesis of a new heterocyclic dye compound as an indicator in acid and base reactions</p><p> </p>
 
Added Entry - Uncontrolled Name Khorsandi Chenarboo, Mahdi ; Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran
Ebrahimi, Mahmoud ; Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran
Pordel, Mehdi ; Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran
Razmi, Mina ; Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran
 
Uncontrolled Index Term 3-Nitroimidazo [1,2-a] pyridine, nucleophilic substitution of hydrogen, indicator, spectroscopy
 
Summary, etc. <p class="Keywords">In the present research, the use of 2-(3-hydroxyamino-2,3-dihydroimidazo[1,2-<em>a</em>]pyridine-2-ylidene)-2-(2-tienyl)acetonitrile as a new acid and base indicator in aquatic environments has been investigated. This compound has been synthesized by the reaction of 3-nitroimidazo [1,2-<em>a</em>] pyridine and 2-(2-thienyl) acetonitrile in a methanol solution by the hydrogen nucleophilic substitution. The aqueous-ethanol solution of this compound shows a change in color by adding acid and an base. For the potential function of this reagent as an indicator, the spectral properties of UV-Vis and the equilibrium of acid and base source have been examined. The results show that the reagent is an amphoteric with two stable ionization factors <em>K</em><sub>a</sub> and <em>K</em><sub>b</sub> with poor acid and base properties. Indicator dissociation constants in aqueous solutions specified by spectrophotometric method are <em>p</em>K<sub>a</sub> = 9.73 and <em>p</em>K<sub>b</sub> = 11.57. The types of base that can be titrated with this index have been reported. This index has been compared with effective acid and base indexes with similar <em>p</em>H range.</p><p class="Keywords"> </p>
 
Publication, Distribution, Etc. Indian Journal of Chemistry -Section B (IJC-B)
2021-02-15 15:57:41
 
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http://op.niscair.res.in/index.php/IJCB/article/view/30182
 
Data Source Entry Indian Journal of Chemistry -Section B (IJC-B); ##issue.vol## 60, ##issue.no## 2 (2021): Indian Journal of Chemistry Section - B (IJCB)
 
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http://op.niscair.res.in/index.php/IJCB/article/download/30182/465492840
http://op.niscair.res.in/index.php/IJCB/article/download/30182/465492841
http://op.niscair.res.in/index.php/IJCB/article/download/30182/465492842
http://op.niscair.res.in/index.php/IJCB/article/download/30182/465492843
http://op.niscair.res.in/index.php/IJCB/article/download/30182/465493017
http://op.niscair.res.in/index.php/IJCB/article/download/30182/465493018
 
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