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Volumn 125, Issue 34, 2003, Pages 10319-10326

Radical cage effects in the photochemical degradation of polymers: Effect of radical size and mass on the cage recombination efficiency of radical cage pairs generated photochemically from the (CpCH2CH 2N(CH3)C(O)(CH2)nCH 3)2Mo2(CO)6 (n = 3, 8, 18) complexes

Author keywords

[No Author keywords available]

Indexed keywords

PHOTOCHEMICAL DEGRADATION;

EID: 0041887254     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja035030r     Document Type: Article
Times cited : (23)

References (59)
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    • note
    • (b) The overall quantum yields decreased until a minimum value was reached, at which point a further increase in chain length did not lead to a decrease in quantum yield. At this point, segmental motion presumably dominates molecular motion rather than center-of-mass diffusion, so an increase in chain length will have little effect on the efficiency of the reaction.
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    • note
    • 2 photodissociation was smaller in solution than in the gas phase. It was proposed that the solvent temporarily encapsulates the reactive I• atoms in a "solvent cage", causing them to remain as colliding neighbors before they either recombine or diffuse apart. This concept is illustrated by the reaction in Scheme 2. The point to note is that the formation of free radicals is preceded by the formation of a caged radical pair.
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    • cP among the four dimers.
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    • x.
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    • note
    • 4. This additional mechanism results in a net reaction of the dimer starting material, even at very high viscosities where diffusion of the reactants is severely restricted.
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    • note
    • -1) shows that the free radical trapping reaction cannot compete with the other two processes.
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    • note
    • 2 is discussed in the text.
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    • The computer program Steric was written by B. Craig Taverner, Department of Chemistry, Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.