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Kinetics and energetics of solid state reactions in a photochromic dihydropyridine derivative

✍ Scribed by Ewa Śliwińska; Juliusz Sworakowski

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
127 KB
Volume
9
Category
Article
ISSN
1616-301X

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✦ Synopsis

Results of measurements of the kinetics of thermally driven reactions in

polycrystalline samples of a photochromic dihydropyridine derivative, 4,4-(biphenyl-2,2 H -diyl)-2,6-diphenyl-1-methyl-1,4-dihydropyridine (BDH), are presented. The measurements have been carried out using the differential scanning calorimetry (DSC) technique. Two peaks on DSC curves were observed, probably corresponding to different processes associated with reactions responsible for the bleaching of the coloured material. The activation energy of the bleaching reaction determined from fractional heating experiments amounts to ca 140630 kJ mol À1 . A tentative reaction scheme has been put forward based on the results presented in the paper and on results of earlier experiments and quantum chemical calculations. Copyright *

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