ChemInform Abstract: Time-Resolved Spectroscopic Studies of the Influence of the Electronic Environment on the Charge-Transfer Excited States of Mono- and Di-Nuclear Ru(II) Complexes

ChemInform ◽  
2010 ◽  
Vol 29 (37) ◽  
pp. no-no
Author(s):  
C. G. COATES ◽  
T. E. KEYES ◽  
J. J. MCGARVEY ◽  
H. P. HUGHES ◽  
J. G. VOS ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Spectroscopic Studies ◽  
Time Resolved ◽  
Electronic Environment

scholarly journals Excited States and Intermediates by Time-Resolved Infrared Spectroscopy

1999 ◽  
Vol 19 (1-4) ◽  
pp. 245-251 ◽  
Author(s):  
J. J. Turner ◽  
M. W. George ◽  
I. P. Clark ◽  
I. G. Virrels
Keyword(s):  
Infrared Spectroscopy ◽  
Excited State ◽  
Charge Transfer ◽  
Excited States ◽  
Fast Time ◽  
Time Resolved ◽  
Excited Species ◽  
Charge Transfer Transitions ◽  
Time Resolved Infrared Spectroscopy ◽  
Kinetics Of

For coordination compounds containing CO or CN groups, fast time-resolved infrared spectroscopy (TRIR) provides a convenient method of probing excited states and intermediates. TRIR has proved particularly powerful for probing the structure and kinetics of organometallic intermediates. The interpretation is particularly straightforward when combined with IR data from matrix isolation experiments, although there can be some subtle differences. In excited state studies, shifts in ν(CO) and ν(CN) frequencies, from ground to excited state, are sensitive to the changes in electron distribution on excitation, thus allowing the distinction between charge-transfer and non-charge-transfer transitions. Subtle effects on excited state ν(CO) band positions occur with change from fluid to rigid solvent-“infrared rigidochromism”. There is often a change in ν(CO) band width on excitation; this can be interpreted in terms of specific interactions between the excited species and the solvent. This paper presents some of our recent work in this area.

Dramatic luminescence signal from a Co(ii)-based metal–organic compound due to the construction of charge-transfer bands with Al3+ and Fe3+ ions in water: steady-state and time-resolved spectroscopic studies

2020 ◽  
Vol 44 (11) ◽  
pp. 4376-4385 ◽  
Author(s):  
Pooja Daga ◽  
Prakash Majee ◽  
Debal Kanti Singha ◽  
Priyanka Manna ◽  
Sayani Hui ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Steady State ◽  
Organic Compound ◽  
Spectroscopic Studies ◽  
Charge Transfer Complexes ◽  
Time Resolved ◽  
Luminescence Signal ◽  
Turn On ◽  
Metal Organic

A Co(ii)-based metal–organic compound exhibits luminescence turn-on by Al3+ and quenching by Fe3+ due to the formation of charge-transfer complexes/adducts.

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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