Title of article :
Structure and photolysis of the dimer of 2,2′-(m-phenylene)bis(4,5-diphenylimidazole-2-yl) diradical
Author/Authors :
Okada، نويسنده , , K. and Imamura، نويسنده , , K. and Oda، نويسنده , , M. and Kajiwara، نويسنده , , A. and Kamachi Mudali، نويسنده , , M. and Ishino، نويسنده , , K. and Tashiro، نويسنده , , K. and Kozaki، نويسنده , , M. and Sato، نويسنده , , K. and Takui، نويسنده , , T.، نويسنده ,
Abstract :
The oxidation of 2,2′-(m-phenylene)bis(4,5-diphenylimidazole) 1 with potassium ferricyanide in benzene-aqueous KOH heterogeneous solution gave two dimers 2 and 3; 2: piezochromic and photochromic dimer whose structure is deduced by NMR as an anti isomer of 3,3: photochromic dimer with syn-[3.3]metacyclophane structure elucidated by X-ray structural analysis. Photolysis (>310 nm) of these dimers in frozen CH2Cl2~MTHF (8:1) produced the same triplet species which can be assignable as 2,2′-(m-phenylene)bis(4,5-diphenylimidazole-2-yl) diradical.
