LrgpV1, Istex, Corpus, bibRecord, 000876

Influence of pressure on cyclization of a polystyrene chain. Time-resolved fluorescence measurements

Identifieur interne : 000876 ( Istex/Corpus ); précédent : 000875; suivant : 000877

Influence of pressure on cyclization of a polystyrene chain. Time-resolved fluorescence measurements

Auteurs : A. T. Reis E Sousa ; E. M. S. Castanheira ; J. M. G. Martinho ; S. Saghbini ; F. Baros ; J. C. André ; Mitchell A. Winnik

Source :

Chemical Physics Letters [ 0009-2614 ] ; 1993.

RBID : ISTEX:126A5DDCC7ED58B25D3DC09841C3D02B3645C8FF

English descriptors

Abstract

Abstract: The cyclization of a polystyrene chain (Mn=4500, Mw/Mn=1.08), both ends labelled with 1-pyrenyl groups, was studied in toluene and methylcyclohexane from 1 to 3500 bar. The major effect of pressure on the cyclization rate constant comes from its effect upon the viscosity. Nevertheless, for a full understanding of the results, changes in the quality of the solvent for the polymer should occur in methylcyclohexane (a poor solvent), but not in toluene (a good solvent). The rate of the excimer dissociation process increases with pressure, this being attributed to a decrease of the excimer binding energy, owing to the diminution of the distance between pyrenes in an excimer sandwich conformation.

Url:

https://api.istex.fr/document/126A5DDCC7ED58B25D3DC09841C3D02B3645C8FF/fulltext/pdf

DOI: 10.1016/0009-2614(93)85141-A

Links to Exploration step

ISTEX:126A5DDCC7ED58B25D3DC09841C3D02B3645C8FF

Le document en format XML

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<ce:author><ce:given-name>J.M.G.</ce:given-name>
<ce:surname>Martinho</ce:surname>
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<ce:author><ce:given-name>S.</ce:given-name>
<ce:surname>Saghbini</ce:surname>
<ce:cross-ref refid="AFF2"><ce:sup loc="post">b</ce:sup>
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<ce:author><ce:given-name>F.</ce:given-name>
<ce:surname>Baros</ce:surname>
<ce:cross-ref refid="AFF2"><ce:sup loc="post">b</ce:sup>
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<ce:author><ce:given-name>J.C.</ce:given-name>
<ce:surname>André</ce:surname>
<ce:cross-ref refid="AFF2"><ce:sup loc="post">b</ce:sup>
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<ce:author><ce:given-name>Mitchell A.</ce:given-name>
<ce:surname>Winnik</ce:surname>
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<ce:affiliation id="AFF1"><ce:label>a</ce:label>
<ce:textfn>Centro de Química Fisica Molecular, Complexo I, Instituto Superior Técnico, 1096 Lisbon Codex, Portugal</ce:textfn>
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<ce:affiliation id="AFF2"><ce:label>b</ce:label>
<ce:textfn>GRAPP, UA328 du CNRS, ENSIC/INPL, 1 rue Grandville, 54001 Nancy Cedex, France</ce:textfn>
</ce:affiliation>
<ce:affiliation id="AFF3"><ce:label>c</ce:label>
<ce:textfn>Department of Chemistry, Erindale College, University of Toronto, Toronto, Ontario, Canada M5S 1Al</ce:textfn>
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<ce:abstract class="author"><ce:section-title>Abstract</ce:section-title>
<ce:abstract-sec><ce:simple-para view="all" id="simple-para.0010">The cyclization of a polystyrene chain (<ce:italic>M</ce:italic>
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=4500, <ce:italic>M</ce:italic>
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=1.08), both ends labelled with 1-pyrenyl groups, was studied in toluene and methylcyclohexane from 1 to 3500 bar. The major effect of pressure on the cyclization rate constant comes from its effect upon the viscosity. Nevertheless, for a full understanding of the results, changes in the quality of the solvent for the polymer should occur in methylcyclohexane (a poor solvent), but not in toluene (a good solvent). The rate of the excimer dissociation process increases with pressure, this being attributed to a decrease of the excimer binding energy, owing to the diminution of the distance between pyrenes in an excimer sandwich conformation.</ce:simple-para>
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<name type="personal"><namePart type="given">A.T.</namePart>
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<name type="personal"><namePart type="given">E.M.S.</namePart>
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<name type="personal"><namePart type="given">Mitchell A.</namePart>
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<abstract lang="en">Abstract: The cyclization of a polystyrene chain (Mn=4500, Mw/Mn=1.08), both ends labelled with 1-pyrenyl groups, was studied in toluene and methylcyclohexane from 1 to 3500 bar. The major effect of pressure on the cyclization rate constant comes from its effect upon the viscosity. Nevertheless, for a full understanding of the results, changes in the quality of the solvent for the polymer should occur in methylcyclohexane (a poor solvent), but not in toluene (a good solvent). The rate of the excimer dissociation process increases with pressure, this being attributed to a decrease of the excimer binding energy, owing to the diminution of the distance between pyrenes in an excimer sandwich conformation.</abstract>
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Influence of pressure on cyclization of a polystyrene chain. Time-resolved fluorescence measurements

Influence of pressure on cyclization of a polystyrene chain. Time-resolved fluorescence measurements

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