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Inside Back Cover: Wurster’s Blue‐type Cation Radicals Framed in a 5,10‐Dihydrobenzo[ a ]indolo[2,3‐ c ]carbazole (BIC) Skeleton: Dual Electrochromism with Drastic Changes in UV/Vis/NIR and Fluorescence (Chem. Asian J. 7/2014)
Author(s) -
Suzuki Takanori,
Sakano Yuto,
Tokimizu Yusuke,
Miura Youhei,
Katoono Ryo,
Fujiwara Kenshu,
Yoshioka Naoki,
Fujii Nobutaka,
Ohno Hiroaki
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201490026
Subject(s) - electrochromism , carbazole , chemistry , crystallography , stereochemistry , photochemistry , electrode
Electrochromism The tribenzo analogue of Wurster′s Blue (WB) has a planar disk‐like geometry and resembles Trillium kamtchaticum , the symbol flower of Hokkaido University (see the Inside Back Cover), where the molecule was designed by Takanori Suzuki et al. as a dual electrochromic system exhibiting drastic changes in the UV/Vis/NIR and fluorescence spectra. In collaboration with Hiroaki Ohno′s group at Kyoto University, the precursor diamine, 5,10‐dihydrobenzo[ a ]indolo[2,3‐ b ]carbazole (BIC), was synthesized by a gold(I)‐catalyzed cascade cyclization as a key step. The precursor was then transformed into the stable cation radical characterized as a π‐extended WB‐type species by ESR. The X‐ray analyses on both neutral and cationic states showed paraquinoid‐type bond alternation upon oxidation. For more details, see the Full Paper on page 1841 ff.