Electron transfer fluorescence quenching of napthalenediols by metal ions
IR@NISCAIR: CSIR-NISCAIR, New Delhi - ONLINE PERIODICALS REPOSITORY (NOPR)
View Archive Info| Field | Value | |
| Title |
Electron transfer fluorescence quenching of napthalenediols by metal ions
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| Creator |
Radha, Nachiappan
Swaminathan, Meenakshisundaram |
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| Subject |
Fluorescence quenching
Electron transfer quenching Quenching Transition metal ions Naphthalenediols |
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| Description |
915-919
Fluorescence quenching of four naphthalenediols (1,5-; 1,7-; 2,7-; 2,3-NDs) by transition metal ions (Cu<sup>2+</sup>, Co<sup>2+</sup>, Ni<sup>2+</sup>, Mn<sup>2+</sup>, Zn<sup>2+</sup>, Pb<sup>2+</sup>) has been investigated in 95% water-ethanol mixture. The dynamic quenching is appreciable with all metal ions except Pb<sup>2+</sup>. Cupric ion (Cu<sup>2+</sup>) is found to be an efficient quencher with all naphthalenediols and the sensitivity of 1,7-ND fluorescence is much higher than other naphthalenediols. The quenching rate constants (<em>k</em><sub>q</sub>) have been analyzed for various possible mechanisms. A good correlation of log <em>k</em><sub>q</sub> values with the reduction potentials of metal ions reveals the electron transfer quenching mechanism via a non-emissive exciplex with electron transfer from excited fluorophore to the metal ions. The anomalous behavior of 1,7-ND is explained by its point group symmetry and polarity. |
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| Date |
2018-07-23T05:39:32Z
2018-07-23T05:39:32Z 2018-07 |
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| Type |
Article
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| Identifier |
0975-0975(Online); 0376-4710(Print)
http://nopr.niscair.res.in/handle/123456789/44739 |
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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-A Vol.57A(07) [July 2018]
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