Excited state intramolecular proton transfer in a new o-hydroxy Schiff base in non polar solvents at room temperature and 77 K

1999 ◽  
Vol 55 (14) ◽  
pp. 2861-2868 ◽  
Author(s):  
A Mandal ◽  
A Koll ◽  
A Filarowski ◽  
D Majumder ◽  
S Mukherjee
Keyword(s):  
Schiff Base ◽  
Excited State ◽  
Proton Transfer ◽  
Room Temperature ◽  
Intramolecular Proton Transfer ◽  
Polar Solvents

Ultrafast Measurements of Excited State Intramolecular Proton Transfer (ESIPT) in Room Temperature Solutions of 3-Hydroxyflavone and Derivatives

2001 ◽  
Vol 105 (15) ◽  
pp. 3709-3718 ◽  
Author(s):  
Simon Ameer-Beg ◽  
Stuart M. Ormson ◽  
Robert G. Brown ◽  
Pavel Matousek ◽  
Mike Towrie ◽  
...  
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Room Temperature ◽  
Intramolecular Proton Transfer ◽  
Ultrafast Measurements

scholarly journals A selective NIR-emitting zinc sensor by using Schiff base binding to turn-on excited-state intramolecular proton transfer

2014 ◽  
Vol 2 (14) ◽  
pp. 2008 ◽  
Author(s):  
Junfeng Wang ◽  
Yingbo Li ◽  
Ernest Duah ◽  
Sailaja Paruchuri ◽  
Demin Zhou ◽  
...  
Keyword(s):  
Schiff Base ◽  
Excited State ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Zinc Sensor ◽  
Turn On

Steady-state and Time-resolved Spectroscopic Studies of Benzanilides

1999 ◽  
Vol 54 (8-9) ◽  
pp. 495-502 ◽  
Author(s):  
Józef Heldt ◽  
Janina R. Heldt ◽  
Jerzy Kamiński
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Steady State ◽  
Proton Transfer ◽  
Room Temperature ◽  
Spectroscopic Studies ◽  
Fluorescence Band ◽  
Polar Solvents ◽  
Time Resolved ◽  
Decay Times

Steady-state and time-resolved spectroscopic studies of benzanilide (I) and jV-methylbenzanilide (II)were performed at 298 and 77 K in various solvents. The results indicate that benzanilide fluorescencein non-polar solvents at room temperature involves three independent modes of emission: F1 (LE) normalfluorescence from the initially excited state S1 (LE) with λmax = 320 nm, F2´(PT) fluorescence from the proton transfer tautomer with λmax = 468 nm, F2″CT) fluorescence from the species where intramolecular charge transfer appears, with λmax = 510 nm. At 77 K in MCH a new fluorescence band, Fag, appears at λmax=415 nm instead of the F2(PT) and F2″CT) fluorescence. This new emission originates from benzanilide dipolar aggregates or cis-imidol dimers. The decay times of these emission modes aredifferent.N-methylbenzanilide, dissolved in nonpopular and weakly polar solvents at room temperature and at77 K, shows only two fluorescence modes, i.e., the normal and the charge-transfer emissions at 320 nmand 520 nm, respectively. The fluorescence is deactivated with two decay times, 30 ps and 2.05 ns, inMCH solution.

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