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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Raghavendra, U. P. Thipperudrappa, J. Basanagouda, Mahantesha |
| Description | Country affiliation: India Author Affiliation: Raghavendra UP ( Department of Physics, Bangalore Institute of Technology, Bangalore 560 004, India.); Basanagouda M ( P.G. Department of Studies in Chemistry, K.L.E. Society's P.C. Jabin Science College, Hubli 580 031, India.); Thipperudrappa J ( Department of Physics, B.N.M. Institute of Technology, Bangalore 560 070, India. Electronic address: jtrphy2007@gmail.com.) |
| Abstract | The role of silver nanoparticles on spectroscopic properties of biologically active coumarin dyes 4-p-tolyloxymethyl-benzo[h]coumarin (4PTMBC) and 1-(4-iodophenoxymethyl)-benzo[f]coumarin (1IPMBC) has been investigated using absorption and fluorescence spectroscopy. Silver nanoparticles are synthesized by chemical reduction method and the estimated size by Mie theory is 12 nm. The absorption spectral changes of dyes in the presence of silver nanoparticles suggest their possible interaction with silver nanoparticles. The apparent association constants of the interaction are estimated using Benesi-Hildebrand model. Fluorescence quenching has been observed in both the dyes with the addition of silver nanoparticles. The Stern-Volmer plots of fluorescence quenching are found to be nonlinear showing positive deviation. The magnitudes of quenching rate parameter and fluorescence lifetime measurements indicate the presence of both collisional and static quenching mechanisms. The binding constants and the number of binding sites for the static type of quenching have been estimated from the fluorescence data. The role of diffusion, energy transfer and electron transfer processes in fluorescence quenching mechanism has been discussed. |
| ISSN | 13861425 |
| Volume Number | 150 |
| e-ISSN | 18733557 |
| Journal | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-01-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Coloring Agents Chemistry Coumarins Metal Nanoparticles Silver Absorption, Physicochemical Pharmacokinetics Energy Transfer Fluorescence Fluorescence Resonance Energy Transfer Pharmacology Spectrometry, Fluorescence Journal Article Research Support, Non-u.s. Gov't Discipline Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Atomic and Molecular Physics, and Optics Analytical Chemistry Instrumentation |
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