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Photochromism and light-induced radical behaviours of biindenylidenedione derivatives in solid state

✍ Scribed by Xu Li; Jie Han; Meili Pang; Kaige Cheng; Zhengjie He; Jiben Meng

Book ID
103837899
Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
484 KB
Volume
874
Category
Article
ISSN
0022-2860

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✦ Synopsis

Reactions of 2,2 0 -biindanylidene-1,1 0 ,3,3 0 -tetraone with arylmagnesium bromide gave 3,3 0 -diaryl-3,3 0 -dihydroxy biindenylidenedione derivatives. These compounds exhibited photochromism in solid state, in which the formation of the isomeric radical species was confirmed by the election spin resonance spectroscopy, and the structures of new compounds 1 and 4 were determined by X-ray crystallography. The relationship between structures and properties was also discussed.

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## 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