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Synthesis of a new heterocyclic dye compound as an indicator in acid and base reactions

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Title Synthesis of a new heterocyclic dye compound as an indicator in acid and base reactions
 
Creator Chenarboo, Mahdi Khorsandi
Ebrahimi, Mahmoud
Pordel, Mehdi
Razmi, Mina
 
Subject 3-Nitroimidazo [1,2-a] pyridine
Nucleophilic substitution of hydrogen
Indicator
Spectroscopy
 
Description 287-290
In the present research, the use of 2-(3-hydroxyamino-2,3-dihydroimidazo[1,2-a]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-a] 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 Ka and Kb with poor acid and base properties. Indicator dissociation constants in aqueous solutions specified by spectrophotometric method are pKa = 9.73 and pKb = 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 pH range.
 
Date 2021-02-11T10:22:08Z
2021-02-11T10:22:08Z
2021-02
 
Type Article
 
Identifier 0975-0983(Online); 0376-4699(Print)
http://nopr.niscair.res.in/handle/123456789/56210
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJC-B Vol.60B(02) [February 2021]