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Photophysical and photochemical studies of chlorophyll a and cobalt(II)tetraphenylporphyrin in poly(l-glutamate)-decylammonium ion complex

Paper ID Volume ID Publish Year Pages File Format Full-Text
31173 44561 2007 9 PDF Available
Title
Photophysical and photochemical studies of chlorophyll a and cobalt(II)tetraphenylporphyrin in poly(l-glutamate)-decylammonium ion complex
Abstract

Spectroscopic studies were carried out on chlorophyll a and cobalt(II)tetraphenylporphyrin solubilized in a poly(l-glutamate) (Poly(Glu))-decylammonium chloride (DeAC) complex system, in the presence of methylviologen (MV2+). The cooperative binding occurred between the anionic Poly(Glu) and the cationic DeAC, leading to the formation of micelle-like hydrophobic clusters of DeAC and also the change in conformation of the Poly(Glu) from the random coil to the α-helix. All of the absorption spectra, the fluorescence quantum yields and the fluorescence lifetimes indicated the existence of equilibrium between the aggregated biofunctional molecules in the bulk phase and the monomeric species in the complex phase of the Poly(Glu)–DeAC solution. The fluorescence quenching of the biofunctional molecules by methylviologen indicates that the conformation-dependent electron transfer occurs in the complex phase.

Keywords
Chlorophyll a; Cobalt(II)tetraphenylporphyrin; Poly(l-glutamate); Conformation change; Cooperative binding; Electron transfer
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Photophysical and photochemical studies of chlorophyll a and cobalt(II)tetraphenylporphyrin in poly(l-glutamate)-decylammonium ion complex
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 87, Issue 3, 26 June 2007, Pages 154–162
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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