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Effects of conformation on the luminescence properties of 2,2′-bipyridine ans 2,2′-biquinoline

✍ Scribed by Mikio Yagi; Masafumi Torii; Natsuko Yamauchi; Takashi Kaneshima; Jiro Higuchi

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
363 KB
Volume
187
Category
Article
ISSN
0009-2614

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✦ Synopsis

Luminescence and EPR spectra have been observed for the lowest excited states of trans-2,2'-bipyridine (trans-bpy), metalfree cis-bpy, tram-2,2'-biquinoline (trans-bq) and metal-free cis-bq in rigid solutions at 77 K. Both trans and cis conformers are nonfluorescent or very weakly fluorescent for bpy, trans-bq is nonfluorescent or very weakly fluorescent, while cis-bq is fluorescent, The observed fluorescence properties are expected considering that the main character of the lowest excited singlet state changes from 'nx* in trans-bq to 'rrx* in cis-bq, while it is 'mt' in both tram and cis conformers of bpy.

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