hysteretic tricolor electrochromic systems based on the dynamic redox properties of unsymmetrically substituted dihydrophenanthrenes and biphenyl-2,2'-diyl dications: efficient precursor synthesis by a flow microreactor method

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ID: 258986
2011
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Abstract
A series of biphenyl-2,2'-diylbis(diarylmethanol)s 3, which have two kinds of aryl groups at the bay region, were efficiently obtained by integrated flow microreactor synthesis. The diols 3NO/NX are the precursors of unsymmetric biphenylic dications 2NO/NX2+, which are transformed into the corresponding dihydrophenanthrenes 1NO/NX via 2NO/NX+• upon reduction, when they exhibit two-stage color changes. On the other hand, the steady-state concentration of the intermediate 2NO/NX+• is negligible during the oxidation of 1NO/NX to 2NO/NX2+, which reflects unique tricolor electrochromicity with a hysteretic pattern of color change [color 1→color 2→color 3→color 1].
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Authors ;Kenshu Fujiwara;Hidetoshi Kawai;Aiichiro Nagaki;Naofumi Takabayashi;Takanori Suzuki;Jun-ichi Nishida;Yusuke Ishigaki;Jun-ichi Yoshida
Journal Nature Materials
Year 2011
DOI
10.3390/ma4111906
URL
http://www.mdpi.com/1996-1944/4/11/1906/
Keywords
cationic dye electrochromism organic dye hysteresis electronics civil engineering (general)microscopydescriptive and experimental mechanics nuclear engineeringengineering (general)

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