Dispersive first-order reactions. II. Photochromic model system

U. Albrecht, H. Schäfer, R. Richert

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)61-68
Number of pages8
JournalChemical Physics
Issue number1
StatePublished - Apr 15 1994
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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