| Effects of lipid structure on energy transfer from carbazolyl to anthryl groups in a lipid bilayer. | |
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MedLine Citation:
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PMID: 1420948 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two types of chromophoric amphiphiles were synthesized: one of them possesses a molecular structure of N,N-dialkyl aromatic amino acid (5X18 type, where X is A or Cz), and the other alpha,gamma-dialkylglutamate connected to aromatic amino acid (mXG12 type, where m is an integer). 5-N-Ethylcarbazolyl and 9-anthryl groups were chosen as the chromophore, and introduced to each amino acid derivative. All the amphiphiles formed assembly showing gel-liquid crystalline phase transition. The phase-transition temperature of the assembly composed of mXG12-type amphiphile was higher than that of 5X18-type amphiphile. Absorption and CD spectra of 6-(trimethylammonium)hexanoyl-L-3-(5-N-ethylcarbazolyl) alanine N,N-dioctadecylamide bromide (5Cz18) in the assembly indicated the absence of strong ground-state interactions between the carbazolyl groups, while those of 6-(trimethylammonium)hexanoyl-L-3-(5-N-ethylcarbazolyl)alanyl-L-gl utamic acid alpha,gamma-didodecyl ester (5CzG12) or 11-(trimethylammonium)undecanoyl-L-3-(5-N-ethylcarbazolyl)al anyl-L-glutamic acid alpha,gamma-didodecyl ester (10CzG12) indicated the ground-state interactions based on dimer or higher aggregates. Fluorescence spectra of 5Cz18 showed very weak excimer emission, while excimer and/or excited dimer or higher aggregates were observed in the assembly of 5CzG12 or 10CzG12. Similar results were obtained for amphiphiles (mAG12) with anthryl and hydroxyethyldimethylammonium groups in places respectively of carbazolyl and trimethylammonium groups of 5CzG12 and 10CzG12. Taking these results together into consideration, the molecular packing of mXG12 in the assembly should be tighter than that of 5X18. In the binary assembly of 6-(trimethylammonium)hexanoyl-L-3-(9-anthryl) alanine N,N-dioctadecylamide bromide (5A18)/5Cz18 (1/99 mol/mol), about 60% of photoenergy absorbed by the carbazolyl groups was transferred to the anthryl groups, indicating an efficient energy migration along the two-dimensional array of carbazolyl chromophores of 5Cz18. On the other hand, in the mCzG12/mAG12 binary assembly, the energy-transfer efficiency was much lower due to the formation of dimer or the higher aggregates acting as energy-dissipating sites. |
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Authors:
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K Taku; H Sasaki; S Kimura; Y Imanishi |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Biophysical chemistry Volume: 44 ISSN: 0301-4622 ISO Abbreviation: Biophys. Chem. Publication Date: 1992 Oct |
Date Detail:
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Created Date: 1992-12-18 Completed Date: 1992-12-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0403171 Medline TA: Biophys Chem Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 187-98 Citation Subset: IM |
Affiliation:
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Department of Polymer Chemistry, Kyoto University, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anthracenes
/
chemical synthesis,
chemistry* Calorimetry, Differential Scanning / methods Carbazoles / chemical synthesis, chemistry* Circular Dichroism Energy Transfer Lipid Bilayers* Molecular Conformation Spectrometry, Fluorescence Structure-Activity Relationship |
| Chemical | |
Reg. No./Substance:
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0/Anthracenes; 0/Carbazoles; 0/Lipid Bilayers |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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