Solvent effects on the fluorescence quenching rate constant of an intramolecular exciplex by poly(chlorobenzenes)

1996 ◽  
Vol 92 (18) ◽  
pp. 3327 ◽  
Author(s):  
Carlos A. Chesta ◽  
Vicente Avila ◽  
Arnaldo T. Soltermann ◽  
Carlos M. Previtali ◽  
Juan J. Cosa ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Rate Constant ◽  
Solvent Effects ◽  
Quenching Rate ◽  
Quenching Rate Constant

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.

Diffusional Fluorescence Quenching of Aromatic Hydrocarbons

2003 ◽  
Vol 57 (5) ◽  
pp. 538-544 ◽  
Author(s):  
Clelia Canuel ◽  
Sophie Badre ◽  
Henning Groenzin ◽  
Markus Berheide ◽  
Oliver C. Mullins
Keyword(s):  
Fluorescence Quenching ◽  
Molecular Oxygen ◽  
Rate Constant ◽  
Aromatic Hydrocarbons ◽  
Diffusion Rate ◽  
Energy Difference ◽  
Quenching Rate ◽  
Quenching Rate Constant ◽  
Diffusion Rate Constant ◽  
Organic Fluorophore

The quenching of the fluorescence of five aromatic hydrocarbons by three halogenated organics and by molecular oxygen has been measured. Both fluorescence intensity and fluorescence lifetime measurements have been employed to validate results and interpretation; linear Stern–Volmer analyses are shown to apply throughout. The fluorescence quenching rate constant of molecular oxygen for the five aromatic hydrocarbons is essentially equivalent to the diffusion rate constant independent of the fluorophore excitation energy. The halogenated organic–fluorophore rate constants vary by a factor of 965 and are shown to correlate roughly with the energy difference between the quencher and fluorophore excited electronic states in accord with a standard model of quantum two-level mixing. The value of the coupling interaction energy is ∼2500 cm−1.

Fluorescence quenching in micelles: A theoretical model for the intramicellar first order quenching rate constant

1981 ◽  
Vol 74 (2) ◽  
pp. 1140-1147 ◽  
Author(s):  
M. Van der Auweraer ◽  
J. C. Dederen ◽  
E. Geladé ◽  
F. C. De Schryver
Keyword(s):  
Theoretical Model ◽  
Fluorescence Quenching ◽  
Rate Constant ◽  
Quenching Rate ◽  
First Order ◽  
Quenching Rate Constant

Temperature dependence of the O+I(P21/2)→O+I(P23/2) quenching rate constant

2009 ◽  
Vol 105 (9) ◽  
pp. 094911 ◽  
Author(s):  
Pavel A. Mikheyev ◽  
David J. Postell ◽  
Michael C. Heaven
Keyword(s):  
Temperature Dependence ◽  
Rate Constant ◽  
Quenching Rate ◽  
Quenching Rate Constant

Quenching rate constant for O(1S)+NO

1972 ◽  
Vol 1 (4) ◽  
pp. 341-344 ◽  
Author(s):  
R. Atkinson ◽  
K.H. Welge
Keyword(s):  
Rate Constant ◽  
Quenching Rate ◽  
Quenching Rate Constant

Phenyl Substitution Effects on Triplet–Triplet Absorption Spectra: I. Study of 1,3,6,8-Tetraphenylpyrene

1975 ◽  
Vol 53 (21) ◽  
pp. 3269-3275 ◽  
Author(s):  
C. Rullière ◽  
E. C. Colson ◽  
P. C. Roberge
Keyword(s):  
Absorption Spectrum ◽  
Triplet State ◽  
Absorption Spectra ◽  
Rate Constant ◽  
Theoretical Calculations ◽  
Vibrational Structure ◽  
Substitution Effects ◽  
Quenching Rate ◽  
Diffusion Controlled ◽  
Quenching Rate Constant

The triplet–triplet (T–T) absorption spectrum of 1,3,6,8-tetraphenylpyrene (TPP) was measured from 400 to 620 nm. The data obtained are compared with theoretical calculations using the Ruedenberg–Scherr FEMO model. A planar triplet state is evidenced by fine vibrational structure. The T–T quenching rate constant measured (1.3 ± 0.1 × 109 M−1 s−1) is 20% of the expected diffusion-controlled value.

Sign in / Sign up

Export Citation Format

Share Document