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High-Contrast Electroswitching of Emission and Coloration Based on Single-Molecular Fluoran Derivatives
journal contribution
posted on 2014-08-07, 00:00 authored by Kenji Kanazawa, Kazuki Nakamura, Norihisa KobayashiMultifunctional electroswitching
of both emission and coloration
was demonstrated by using fluoran derivatives in an electrolytic solution.
Further, in order to investigate changes in the photophysical properties
induced by electrical stimuli, we measured cyclic voltammogram, absorption
spetra, emission spectra, and molecular orbital calculation. The mechanism
for this electroswitching was attributed to the reversible electrochemically
induced closing and opening of the lactone ring in the fluoran molecule.
All neutral fluoran molecules were colorless and did not exhibit any
fluorescence, while the oxidized (lactone ring-opened form) molecule
was yellow and displayed a green fluorescence as a consequence of
the extended, planar, conjugated system. Furthermore, this fluoran
molecule achieved reversible electroswitchable emission and coloration
with high on/off contrast.