Structure and photolysis of the dimer of 2,2 '-(m-phenylene)bis(4,5-diphenylimidazole-2-yl) diradical

Authors
Okada, K Imamura, K Oda, M Kajiwara, A Kamachi, M Ishino, K Tashiro, K Kozaki, M Sato, K Takui, T
Citation
K. Okada et al., Structure and photolysis of the dimer of 2,2 '-(m-phenylene)bis(4,5-diphenylimidazole-2-yl) diradical, SYNTH METAL, 103(1-3), 1999, pp. 2308-2309
Citations number
5
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SYNTHETIC METALS
ISSN journal
03796779 → ACNP
Volume
103
Issue
1-3
Year of publication
1999
Pages
2308 - 2309
Database
ISI
SICI code
0379-6779(199906)103:1-3<2308:SAPOTD>2.0.ZU;2-P
Abstract
The oxidation of 2,2'-(m-phenylene)bis(4,5-diphenylimidazole) 1 with potass ium ferricyanide in benzene-aqueous KOH heterogeneous solution gave two dim ers 2 and 3; 2 piezochromic and photochromic dimer whose structure is deduc ed by NMR as an anti isomer of 3, 3. photochromic dimer with syn-[3.3]metac yclophane structure elucidated by X-ray structural analysis. Photolysis (>3 10 nm) of these dimers in frozen CH2Cl2-MTHF (8 : 1) produced the same trip let species which can be assignable as 2, 2'-(m-phenylene)bis(4,5-diphenyli midazole-2-yl) diradical.