Fluorescence monitoring of pH dependent complexation of chlorin p6 with surfactants
DSpace at IIT Bombay
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Title |
Fluorescence monitoring of pH dependent complexation of chlorin p6 with surfactants
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Creator |
MISHRA, PADMAJA P
BHATNAGAR, JAYA DATTA, ANINDYA |
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Subject |
organic compounds
surfactants radiative lifetimes fluorescence |
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Description |
We have observed the pH-dependent formation of electrostatic complexes of chlorin p6 with surfactants in submicellar concentrations. Successive protonation of the ionizable groups cause a progressively increasing positive charge on the fluorophore as the pH decreases. Complexes are formed with the cationic CTAB at pH 7 and 5 and with the anionic SDS at pH 3, as manifested in a decrease in fluorescence quantum yield and radiative lifetime at low surfactant concentrations. The fluorescence quantum yield and lifetime are observed to increase beyond certain concentrations of the surfactants and saturate before the critical micellar concentrations are reached. The variation in the fluorescence parameters is rationalized by a competitive model involving pH-induced and surfactant-induced aggregates.
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Publisher |
Elsevier
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Date |
2009-02-27T11:07:06Z
2011-11-25T18:00:34Z 2011-12-26T13:06:45Z 2011-12-27T05:54:45Z 2009-02-27T11:07:06Z 2011-11-25T18:00:34Z 2011-12-26T13:06:45Z 2011-12-27T05:54:45Z 2004 |
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Type |
Article
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Identifier |
Chemical Physics Letters 386(1-3), 158-161
0009-2614 http://dx.doi.org/10.1016/j.cplett.2004.01.057 http://hdl.handle.net/10054/799 http://dspace.library.iitb.ac.in/xmlui/handle/10054/799 |
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Language |
en
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