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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kedia, Niraja Sarkar, Amrita Purkayastha, Pradipta Bagchi, Sanjib |
| Description | Country affiliation: India Author Affiliation: Kedia N ( Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur Campus, BCKV Main P.O., Nadia 741252, India.); Sarkar A ( Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur Campus, BCKV Main P.O., Nadia 741252, India.); Purkayastha P ( Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur Campus, BCKV Main P.O., Nadia 741252, India.); Bagchi S ( Presidency University, 86/1, College Street, Kolkata 700073, India. Electronic address: bsanjibb@yahoo.com.) |
| Abstract | Solvatochromic absorption and fluorescence bands of a donor-acceptor dye have been utilised for following the micellisation and for probing the polarity of the aqueous homomicellar phase provided separately by cationic (cetyltrimethylammonimum bromide, CTAB and dodecyltrimethylammonimum bromide, DTAB) and anionic (sodium dodecyl sulphate, SDS) surfactant. Results indicate that for a low concentration of surfactant (below cmc) the dye forms a dimer in aqueous solution. In a micellar media, however, the dye exists as monomers. A strong dye-micelle interaction, as indicated by the shift of the solvatochromic intramolecular charge transfer band of the dye, has also been indicated. The absorption and fluorescence parameters of the dye have been utilised for studying the onset of aggregation of the surfactants. An iterative procedure has been developed for the estimation of cmc and the distribution coefficient (KD) of the dye between the aqueous and the micellar phase. All the parameters provide convergent values of cmc. A high value of KD indicates that the dye exists predominantly in the micellar phase. The solvatochromic parameters characterising the dipolarity-polarisability (π(*)) and H-bond donation ability ( ) of modes of solvation interaction in different micellar media have been estimated. The dye is found to distribute itself between two regions in a catanionic vesicle formed by surfactants SDS and DTAB, one being relatively polar than other. The distribution coefficients have been found out using the fluorescence data. |
| ISSN | 13861425 |
| Volume Number | 131 |
| e-ISSN | 18733557 |
| Journal | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-10-15 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Cetrimonium Compounds Chemistry Coloring Agents Micelles Sodium Dodecyl Sulfate Surface-active Agents Anions Cations Electrons Hydrogen Bonding 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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