Direct Observation of Odd−Even Effect in Dilute Polymeric Solutions: A Time-Resolved Fluorescence Anisotropy Study
The odd−even effect is demonstrated, for the first time, in dilute polymeric solutions of polyethers, consisting of substituted luminescent quinquephenyl units which are connected by flexible aliphatic chains of 7−12 methylene groups. The effect, which is demonstrated by means of steady state and ti...
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Published in | The journal of physical chemistry. B Vol. 109; no. 23; pp. 11538 - 11543 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Chemical Society
16.06.2005
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Online Access | Get full text |
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Summary: | The odd−even effect is demonstrated, for the first time, in dilute polymeric solutions of polyethers, consisting of substituted luminescent quinquephenyl units which are connected by flexible aliphatic chains of 7−12 methylene groups. The effect, which is demonstrated by means of steady state and time resolved fluorescence anisotropy, has been attributed to the different mutual orientation of the luminescent dipoles, in the odd (7, 9, 11) and even (8, 10, 12) polymers. Namely, as the temperature of the solution is lowered the flexible aliphatic chains adopt the nearly all-staggered lowest energy conformation, which results in different mutual orientations of the fluorophores in the two types of polymers. |
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Bibliography: | istex:F2F03127571DC5196E5D1E6A336D8D5329980C43 ark:/67375/TPS-TR1SLBJQ-C ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1520-6106 1520-5207 |
DOI: | 10.1021/jp044662c |