Partial charge transfer contribution to the solvent isotope effect and photosensitized generation of singlet oxygen, O2(1Δg), by substituted ruthenium(ii) bipyridyl complexes in aqueous media

2014 ◽  
Vol 13 (9) ◽  
pp. 1330-1337 ◽  
Author(s):  
Ayman A. Abdel-Shafi ◽  
Hanaa A. Hassanin ◽  
Shar S. Al-Shihry
Keyword(s):  
Charge Transfer ◽  
Singlet Oxygen ◽  
Isotope Effect ◽  
Aqueous Media ◽  
Ruthenium Complexes ◽  
Partial Charge ◽  
Partial Charge Transfer ◽  
Solvent Isotope Effect ◽  
Solvent Isotope

Solvent isotope effect on the lifetime of the excited3MLCT states of ruthenium complexes,τD0/τH0, was found to depend on partial charge transfer to solvent as found from their dependence on theEoxof these complexes.

Lifetime of Singlet Oxygen and Quenching by NaN3 in Mixed Solvents

1982 ◽  
Vol 37 (5) ◽  
pp. 649-652 ◽  
Author(s):  
N. Miyoshi ◽  
M. Ueda ◽  
K. Fuke ◽  
Y. Tanimoto ◽  
M. Itoh ◽  
...  
Keyword(s):  
Activation Energy ◽  
Charge Transfer ◽  
Singlet Oxygen ◽  
Mixed Solvents ◽  
Solvent Polarity ◽  
Thermal Lensing ◽  
Partial Charge ◽  
Partial Charge Transfer ◽  
Quenching Rate ◽  
Quenching Rate Constant

Singlet oxygen was generated by the photosensitization of erythrosine. The lifetime of singlet oxygen and the quenching rate constant for singlet oxygen by NaN3 were measured by a thermal lensing method in MeOH-H2O mixed solvents. The reciprocal of the lifetime increased linearly with the increase of the H2O mole fraction. Semi-log plot of the quenching constant against the reciprocal of the solvent polarity exhibited a linear relation. The quenching of the singlet oxygen by NaN3 may proceed through a partial charge-transfer intermediate. The activation energy for the quenching reaction of N3- + 1O2 →[N3·1O2-] increased with the increase of the solvent polarity. The lifetime was also measured in MeOH-ethyleneglycol mixed solvents, and its relation with viscosity was obtained

Solvent Isotope Effect on the Rate Constants of Singlet-Oxygen Quenching by edta and Its Metal Complexes

1994 ◽  
Vol 77 (3) ◽  
pp. 859-868 ◽  
Author(s):  
Diane P. Hessler ◽  
Fritz H. Frimmel ◽  
Esther Oliveros ◽  
Andr� M. Braun
Keyword(s):  
Metal Complexes ◽  
Singlet Oxygen ◽  
Isotope Effect ◽  
Rate Constants ◽  
Oxygen Quenching ◽  
Solvent Isotope Effect ◽  
Singlet Oxygen Quenching ◽  
Solvent Isotope

Kinetic solvent isotope effect studies on the methanolysis of 1-phenylethyl chlorides

1993 ◽  
Vol 6 (6) ◽  
pp. 361-366 ◽  
Author(s):  
Ikchoon Lee ◽  
Won Heui Lee ◽  
Hai Whang Lee
Keyword(s):  
Isotope Effect ◽  
Solvent Isotope Effect ◽  
Solvent Isotope

Neutral Solvolysis of Acyl Carbon and the Temperature Dependence of the Kinetic Solvent Isotope Effect

1975 ◽  
Vol 53 (6) ◽  
pp. 869-877 ◽  
Author(s):  
B. Rossall ◽  
R. E. Robertson
Keyword(s):  
Temperature Dependence ◽  
Isotope Effect ◽  
Solvent Isotope Effect ◽  
Acyl Carbon ◽  
Rate Of Hydrolysis ◽  
Solvent Isotope ◽  
Neutral Conditions ◽  
Hydrolysis Of

The temperature dependence of the rate of hydrolysis of benzoic, phthalic, and succinic anhydrides have been determined in H2O and D2O under "neutral" conditions. Corresponding data have been obtained for methyl trifluoroacetate. While both series supposedly react by the same BAc2 mechanism, remarkable differences are made obvious by this investigation. Possible sources of such differences are proposed.

Proton-coupled electron transfer between [Ru(bpy)2(py)OH2]2+ and [Ru(bpy)2(py)O]2+. A solvent isotope effect (kH2O/kD2O) of 16.1

1981 ◽  
Vol 103 (10) ◽  
pp. 2897-2899 ◽  
Author(s):  
Robert A. Binstead ◽  
Bruce A. Moyer ◽  
George J. Samuels ◽  
Thomas J. Meyer
Keyword(s):  
Electron Transfer ◽  
Isotope Effect ◽  
Solvent Isotope Effect ◽  
Proton Coupled Electron Transfer ◽  
Solvent Isotope

An Unusual Solvent Isotope Effect in the Reaction of W(CO)5(solv) (solv = Cyclohexane or Cyclohexane-d12) with THF

2000 ◽  
Vol 19 (9) ◽  
pp. 1682-1691 ◽  
Author(s):  
Riki Paur-Afshari ◽  
J. Lin ◽  
Richard H. Schultz
Keyword(s):  
Isotope Effect ◽  
Solvent Isotope Effect ◽  
Solvent Isotope

Notizen: 67Zn NMR Anomalous Solvent Isotope Effect in Aqueous Solutions

1974 ◽  
Vol 29 (4) ◽  
pp. 660-661 ◽  
Author(s):  
B. W. Epperlein ◽  
H. Krüger ◽  
. Lutz ◽  
A. Schwenk
Keyword(s):  
Aqueous Solutions ◽  
Isotope Effect ◽  
Solvent Isotope Effect ◽  
Zinc Bromide ◽  
The Difference ◽  
Solvent Isotope

For 67Zn NMR lines of solutions of ZnCl2, ZnBr2, and ZnI2 in H2O and D2O an anomalous solvent isotope effect is reported. In D2O solutions the lines are shifted to higher frequencies. The difference between the shieldings in H2O and D2O is e.g. σ(H2O) - σ(D2O) = (13.1 ±0.7) ppm for a concentration of 0.02 moles zinc bromide per mole solvent.

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