Synthesis of a new heterocyclic dye compound as an indicator in acid and base reactions
IR@NISCAIR: CSIR-NISCAIR, New Delhi - ONLINE PERIODICALS REPOSITORY (NOPR)
View Archive Info| Field | Value | |
| Title |
Synthesis of a new heterocyclic dye compound as an indicator in acid and base reactions
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| Creator |
Chenarboo, Mahdi Khorsandi
Ebrahimi, Mahmoud Pordel, Mehdi Razmi, Mina |
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| Subject |
3-Nitroimidazo [1,2-a] pyridine
Nucleophilic substitution of hydrogen Indicator Spectroscopy |
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| Description |
287-290
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. |
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| Date |
2021-02-11T10:22:08Z
2021-02-11T10:22:08Z 2021-02 |
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| Type |
Article
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| Identifier |
0975-0983(Online); 0376-4699(Print)
http://nopr.niscair.res.in/handle/123456789/56210 |
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| Language |
en_US
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| Rights |
<img src='http://nopr.niscair.res.in/image/cc-license-sml.png'> <a href='http://creativecommons.org/licenses/by-nc-nd/2.5/in' target='_blank'>CC Attribution-Noncommercial-No Derivative Works 2.5 India</a>
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| Publisher |
NISCAIR-CSIR, India
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| Source |
IJC-B Vol.60B(02) [February 2021]
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