Photophysical parameters and fluorescence quenching of 7-diethylaminocoumarin (DEAC) laser dye

2011 ◽  
Vol 43 (7) ◽  
pp. 1078-1083 ◽  
Author(s):  
E.H. El-Mossalamy ◽  
A.Y. Obaid ◽  
S.A. El-Daly
Keyword(s):  
Fluorescence Quenching ◽  
Laser Dye ◽  
Photophysical Parameters

scholarly journals Photophysical Parameters, Excitation Energy Transfer, and Photoreactivity of 1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOP) Laser Dye

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Samy A. El-Daly ◽  
Saleh A. El-Azim ◽  
Farouk M. Elmekawey ◽  
Bahgat Y. Elbaradei ◽  
Sayed A. Shama ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Excitation Energy Transfer ◽  
Laser Dye ◽  
Photophysical Parameters

A study on fluorescence quenching of a laser dye by aromatic amines in alcohols

2015 ◽  
Vol 93 (4) ◽  
pp. 469-474 ◽  
Author(s):  
H.R. Deepa ◽  
J. Thipperudrappa ◽  
H.M. Suresh Kumar
Keyword(s):  
Fluorescence Quenching ◽  
Aromatic Amines ◽  
Room Temperature ◽  
Static Quenching ◽  
Laser Dye ◽  
Approximation Model ◽  
Positive Deviation ◽  
Quenching Rate ◽  
Time Resolved ◽  
Bimolecular Quenching

The fluorescence quenching of 1,2,3,8-tetrahydro-1,2,3,3,8-pentamethyl-5-(trifluoromethyl)-7H-pyrrolo[3,2-g]quinolin-7-one (LD-473) by aromatic amines, namely, aniline, dimethyl aniline, and diethyl aniline, in methanol, ethanol, propanol, and butanol has been studied at room temperature using steady-state and time-resolved methods. A positive deviation from linearity has been observed in Stern–Volmer (S–V) plots. Various quenching rate parameters have been determined using the extended S–V equation and are found to be dependent on the dielectric constant of alcohols. The quenching ability of amines increases with increasing their ionization energies. Further, with the use of the sphere of action, static quenching model, and finite sink approximation model, it is concluded that the bimolecular quenching reactions are due to the combined effect of both dynamic and static quenching processes.

Polyoligopeptides functionalized zinc(II)porphyrins: Step towards artificial hemes

2011 ◽  
Vol 15 (09n10) ◽  
pp. 871-882 ◽  
Author(s):  
Shawkat M. Aly ◽  
Hannah Guernon ◽  
Brigitte Guérin ◽  
Pierre D. Harvey
Keyword(s):  
Fluorescence Quenching ◽  
Click Chemistry ◽  
Computer Modeling ◽  
Rate Constant ◽  
Steric Hindrance ◽  
Rate Constants ◽  
Emission Spectra ◽  
Quenching Rate ◽  
Photophysical Parameters ◽  
Quenching Rate Constant

Two new zinc(II)porphyrin oligopeptide conjugates (zinc(II)-5,10,15,20-bis[4-(peptide)- phenyl]porphyrin (5) and -tetrakis[3,5-di(peptide)phenyl]porphyrin (9; peptide = -CH2(CO)Gly-Phe-Ala-CNH2) were prepared using the click chemistry with azides and ethynyl-containing precursors. The spectroscopic signature (S0→S1 and transient T1→Tn absorption, excitation and emission spectra) are typical for zinc(II)porphyrin and shows no perturbation upon anchoring the oligopeptides, whereas some small decreases in the photophysical parameters (𝜏F and ΦF), and larger decrease in T1 lifetimes are noted, which are attributable to the known "loose bolt" effect. The structure for 9 in solution was addressed qualitatively using computer modeling and the comparison of the bimolecular fluorescence quenching rate constants between 5 and 9 using C60 as a photooxidative agent. While 5 exhibits a totally accessible zinc(II)porphyrin unit for a C60 approach, 9 shows a slower quenching rate constant meaning some steric hindrance must be present.

Solvent polarity studies of highly fluorescent laser dye ADS740WS and its fluorescence quenching with silver nanoparticles

2014 ◽  
Vol 92 (2) ◽  
pp. 116-123 ◽  
Author(s):  
V.B. Tangod ◽  
Prasad Raikar ◽  
B.M. Mastiholi ◽  
U.S. Raikar
Keyword(s):  
Silver Nanoparticles ◽  
Excited State ◽  
Fluorescence Quenching ◽  
Dipole Moments ◽  
Linear Regression Analysis ◽  
Solvent Polarity ◽  
Multiple Linear Regression Analysis ◽  
Laser Dye ◽  
Multilinear Analysis

Determination of ground state and excited state dipole moments of a highly fluorescent laser dye molecule ADS740WS and comparison of excited state dipole moment by Lippert, Bakhashiev, Kawski–Chamma–Viallet, McRae, Suppan, and solvent polarity methods. Kamlet–Abboud–Taft and Katritzky multilinear analysis for characterizing the solvent contribution into spectral features of the dye has also been studied. Correlation analysis of spectroscopic data with multiple polarity parameters was carried out by multiple linear regression analysis. Optical absorption and fluorescence of ADS740WS in alcohol and other solvents with attachment of silver nanoparticles (AgNPs) shows quenching of absorption and fluorescence intensities. This is due to size, shape, and coupling between the AgNPs and the dye, and energy transfer between the dye and the AgNPs. Fluorescence quenching of ADS740WS leads to many applications notably for advancement in biomolecular labeling and fluorescence patterning and chemotherapy in cancer treatment.

Sign in / Sign up

Export Citation Format

Share Document