Fluorescence Decay Characteristics of Indole Compounds Revealed by Time-Resolved Area-Normalized Emission Spectroscopy

2009 ◽  
Vol 113 (12) ◽  
pp. 2847-2853 ◽  
Author(s):  
Takuhiro Otosu ◽  
Etsuko Nishimoto ◽  
Shoji Yamashita
Keyword(s):  
Emission Spectroscopy ◽  
Fluorescence Decay ◽  
Time Resolved ◽  
Indole Compounds

scholarly journals Probing Local Environments by Time-Resolved Stimulated Emission Spectroscopy

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Ana Rei ◽  
Graham Hungerford ◽  
Michael Belsley ◽  
M. Isabel C. Ferreira ◽  
Peter Schellenberg
Keyword(s):  
Emission Spectroscopy ◽  
Sol Gel ◽  
Fluorescence Emission ◽  
Local Environment ◽  
Fluorescence Decay ◽  
Stimulated Emission ◽  
Binary Solvents ◽  
Time Resolved ◽  
Local Environments ◽  
Lower Viscosity

Time-resolved stimulated emission spectroscopy was employed to probe the local environment of DASPMI (4-(4-(dimethylamino)styryl)-N-methyl-pyridinium iodide) in binary solvents of different viscosity and in a sol-gel matrix. DASPMI is one of the molecules of choice to probe local environments, and the dependence of its fluorescence emission decay on viscosity has been previously used for this purpose in biological samples, solid matrices as well as in solution. The results presented in this paper show that time-resolved stimulated emission of DASPMI is a suitable means to probe the viscosity of local environments. Having the advantage of a higher time resolution, stimulated emission can provide information that is complementary to that obtained from fluorescence decay measurements, making it feasible to probe systems with lower viscosity.

scholarly journals Architecture of Polyglutamine-containing Fibrils from Time-resolved Fluorescence Decay

2014 ◽  
Vol 289 (39) ◽  
pp. 26817-26828 ◽  
Author(s):  
Christoph Röthlein ◽  
Markus S. Miettinen ◽  
Tejas Borwankar ◽  
Jörg Bürger ◽  
Thorsten Mielke ◽  
...  
Keyword(s):  
Fluorescence Decay ◽  
Time Resolved Fluorescence ◽  
Time Resolved

Synthesis and Photophysical Properties of a Conformationally Flexible Mixed Porphyrin Star-Pentamer

2009 ◽  
Vol 62 (7) ◽  
pp. 692 ◽  
Author(s):  
Toby D. M. Bell ◽  
Sheshanath V. Bhosale ◽  
Kenneth P. Ghiggino ◽  
Steven J. Langford ◽  
Clint P. Woodward
Keyword(s):  
Energy Transfer ◽  
Photophysical Properties ◽  
Fluorescence Decay ◽  
High Yield ◽  
Free Base ◽  
Time Resolved ◽  
Zinc Porphyrin ◽  
Relative Contribution ◽  
Synthetic Strategy ◽  
Decay Times

The synthesis of a porphyrin star-pentamer bearing a free-base porphyrin core and four zinc(ii) metalloporphyrins, which are tethered by a conformationally flexible linker about the central porphyrin’s antipody, is described. The synthetic strategy is highlighted by the use of olefin cross metathesis to link the five chromophores together in a directed fashion in high yield. Photoexcitation into the Soret absorption band of the zinc porphyrin chromophores at 425 nm leads to a substantial enhancement of central free-base porphyrin fluorescence, indicating energy transfer from the photoexcited zinc porphyrin (outer periphery) to central free-base porphyrin. Time-resolved fluorescence decay profiles required three exponential decay components for satisfactory fitting. These are attributed to emission from the central free-base porphyrin and to two different rates of energy transfer from the zinc porphyrins to the free-base porphyrin. The faster of these decay components equates to an energy-transfer rate constant of 3.7 × 109 s–1 and an efficiency of 83%, whereas the other is essentially unquenched with respect to reported values for zinc porphyrin fluorescence decay times. The relative contribution of these two components to the initial fluorescence decay is ~3:2, similar to the 5:4 ratio of cis and trans geometric isomers present in the pentamer.

scholarly journals Time resolved emission spectroscopy investigations of pulsed laser ablated plasmas of ZrO2and Al2O3

2006 ◽  
Vol 28 ◽  
pp. 100-104 ◽  
Author(s):  
A D Hadoko ◽  
P S Lee ◽  
P Lee ◽  
S R Mohanty ◽  
R S Rawat
Keyword(s):  
Emission Spectroscopy ◽  
Pulsed Laser ◽  
Time Resolved

Time-Resolved FTIR Emission Spectroscopy of Transient Radicals

2005 ◽  
Vol 52 (4) ◽  
pp. 677-686 ◽  
Author(s):  
Laura T. Letendre ◽  
William McNavage ◽  
Charles Pibel ◽  
Ding-Kuo Liu ◽  
Hai-Lung Dai
Keyword(s):  
Emission Spectroscopy ◽  
Time Resolved
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