Dispersive first-order reactions. II. Photochromic model system

U. Albrecht; H. Schäfer; R. Richert

doi:10.1016/0301-0104(94)00012-3

Dispersive first-order reactions. II. Photochromic model system

U. Albrecht, H. Schäfer, R. Richert

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Abstract

The photochromic reactions spiropyran-merocyanine in polymeric matrices have been analysed with respect to their distributions of rates in order to understand the matrix effects on the kinetics in the transition range from a static to fluid environment. Employing the technique of part I we find a static matrix situation only below the Vogel-Fulcher temperature T_VF of the polymer where different species are identified in terms of distinct but distributed decolouration rates. Above the glass transition T_G the ensemble averaged reaction approaches an exponential decay pattern, due to the fluctuations of site specific barriers and exchange mechanisms among the set of merocyanine isomers.

Original language	English (US)
Pages (from-to)	61-68
Number of pages	8
Journal	Chemical Physics
Volume	182
Issue number	1
DOIs	https://doi.org/10.1016/0301-0104(94)00012-3
State	Published - Apr 15 1994
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1016/0301-0104(94)00012-3

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title = "Dispersive first-order reactions. II. Photochromic model system",

abstract = "The photochromic reactions spiropyran-merocyanine in polymeric matrices have been analysed with respect to their distributions of rates in order to understand the matrix effects on the kinetics in the transition range from a static to fluid environment. Employing the technique of part I we find a static matrix situation only below the Vogel-Fulcher temperature TVF of the polymer where different species are identified in terms of distinct but distributed decolouration rates. Above the glass transition TG the ensemble averaged reaction approaches an exponential decay pattern, due to the fluctuations of site specific barriers and exchange mechanisms among the set of merocyanine isomers.",

author = "U. Albrecht and H. Sch{\"a}fer and R. Richert",

note = "Funding Information: We thank P. Wiinsche for a valuable cooperationi n this project. Financial support by the Deutsche For-schungsgemeinschafat nd the Fonds der Chemischen Industrie is gratefully acknowledged.",

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T1 - Dispersive first-order reactions. II. Photochromic model system

AU - Albrecht, U.

AU - Schäfer, H.

AU - Richert, R.

N1 - Funding Information: We thank P. Wiinsche for a valuable cooperationi n this project. Financial support by the Deutsche For-schungsgemeinschafat nd the Fonds der Chemischen Industrie is gratefully acknowledged.

PY - 1994/4/15

Y1 - 1994/4/15

N2 - The photochromic reactions spiropyran-merocyanine in polymeric matrices have been analysed with respect to their distributions of rates in order to understand the matrix effects on the kinetics in the transition range from a static to fluid environment. Employing the technique of part I we find a static matrix situation only below the Vogel-Fulcher temperature TVF of the polymer where different species are identified in terms of distinct but distributed decolouration rates. Above the glass transition TG the ensemble averaged reaction approaches an exponential decay pattern, due to the fluctuations of site specific barriers and exchange mechanisms among the set of merocyanine isomers.

AB - The photochromic reactions spiropyran-merocyanine in polymeric matrices have been analysed with respect to their distributions of rates in order to understand the matrix effects on the kinetics in the transition range from a static to fluid environment. Employing the technique of part I we find a static matrix situation only below the Vogel-Fulcher temperature TVF of the polymer where different species are identified in terms of distinct but distributed decolouration rates. Above the glass transition TG the ensemble averaged reaction approaches an exponential decay pattern, due to the fluctuations of site specific barriers and exchange mechanisms among the set of merocyanine isomers.

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Dispersive first-order reactions. II. Photochromic model system

Abstract

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