Laser flash photolysis of iodine dissolved in hydroxylic solvents. Identification of iodine atom charge transfer complexes

1973 ◽  
Vol 19 (2) ◽  
pp. 251-253 ◽  
Author(s):  
Philipe Fornier de Violet ◽  
Roland Bonneau ◽  
Jacques Joussot-Dubien
Keyword(s):  
Charge Transfer ◽  
Iodine Atom ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Charge Transfer Complexes

A laser flash photolysis study of the behaviour of polyfluorophenyl ketones in solution

1989 ◽  
Vol 67 (5) ◽  
pp. 927-932 ◽  
Author(s):  
D. R. Boate ◽  
L. J. Johnston ◽  
J. C. Scaiano
Keyword(s):  
Charge Transfer ◽  
Hydrogen Transfer ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Oxidation Potential ◽  
Triplet States ◽  
Excellent Correlation ◽  
Triplet Energy ◽  
Keywords Laser

Decafluorobenzophenone triplets, which have a triplet energy very close to that of benzophenone, are much more reactive than benzophenone in quenching reactions that involve hydrogen transfer and/or charge transfer. An excellent correlation has been observed between the rate constants for charge transfer quenching and the oxidation potential of the substrate. In the case of 2-propanol, where the reactivity can be fully accounted for by hydrogen transfer, decafluorobenzophenone is 35 times more reactive than benzophenone. Pentafluorobenzophenone shows intermediate behaviour. Keywords: laser photolysis, benzophenones, triplet states, charge transfer, photoreduction.

Laser flash photolysis of metal oxide supported vanadyl catalysts. Spectroscopic evidence for the ligand-to-metal charge-transfer state

2006 ◽  
Vol 16 (2) ◽  
pp. 216-220 ◽  
Author(s):  
Hermenegildo García ◽  
Jose Manuel López-Nieto ◽  
Emilio Palomares ◽  
Heinz D. Roth ◽  
Benjamín Solsona
Keyword(s):  
Charge Transfer ◽  
Metal Oxide ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Charge Transfer State ◽  
Metal Charge ◽  
Spectroscopic Evidence ◽  
Metal Charge Transfer ◽  
Transfer State

Photochemical transformation of an iron(iii)–arsenite complex in acidic aqueous solution

2016 ◽  
Vol 15 (3) ◽  
pp. 431-439 ◽  
Author(s):  
Ivan P. Pozdnyakov ◽  
Wei Ding ◽  
Jing Xu ◽  
Long Chen ◽  
Feng Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Charge Transfer ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Photochemical Transformation ◽  
Acidic Aqueous Solution ◽  
Metal Charge ◽  
Metal Charge Transfer

An Fe(iii)–As(iii) complex was characterized by UV/Vis spectra and its laser flash photolysis via ligand-to-metal charge transfer resulted in the intermediate of Fe(ii)–As(iv).

Triplet energies of fumaronitrile and maleonitrile

1982 ◽  
Vol 60 (3) ◽  
pp. 339-341 ◽  
Author(s):  
Po Cheong Wong
Keyword(s):  
Charge Transfer ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Benzene Solution ◽  
Laser Flash ◽  
Transfer Mechanism ◽  
Triplet Energy ◽  
Charge Transfer Mechanism ◽  
A Charge

The triplet energies of fumaronitrile and maleonitrile measured by laser flash photolysis technique using the Herkstroeter–Hammond method are both 59 ± 2 kcal mol−1. Our results show that these olefins are classical triplet energy acceptors for non-electron donating sensitizers. With electron donating sensitizers, quenching through a charge-transfer mechanism also occurs in benzene solution.

scholarly journals Understanding charge transfer processes on metal oxides: a laser-flash-photolysis study

2016 ◽  
Author(s):  
Fabian Sieland ◽  
Jenny Schneider ◽  
Thorsten Lippmann ◽  
Detlef W. Bahnemann
Keyword(s):  
Charge Transfer ◽  
Metal Oxides ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Transfer Processes

The recombination of atoms, IV. Iodine atom complexes

1961 ◽  
Vol 262 (1311) ◽  
pp. 476-488 ◽  
Keyword(s):  
Charge Transfer ◽  
Complex Formation ◽  
Iodine Atom ◽  
Transient Absorption ◽  
Flash Photolysis ◽  
Equilibrium Constants ◽  
Vapour Phase ◽  
Charge Transfer Complexes ◽  
Transient Absorption Spectra ◽  
Diffusion Controlled

Transient absorption spectra have been detected after flash photolysis of iodine in a variety of solvents. There is some correlation between the wavelength of maximum absorption and the ionization potential of the solvent and the spectra are attributed to the charge transfer complexes between iodine atoms and the solvent which were predicted in part III. In the case of methyl iodide as chaperon a weak transient has also been observed in the vapour phase. The decay of the complex follows a second-order law and rate constants have been measured in six solvents. Values for the extinction coefficient are derived by assuming that the reaction is diffusion controlled. Equilibrium constants of complex formation have been measured in ethyl iodide and ethyl bromide.

Effect of methyl substitution on the intramolecular triplet deactivation of p-methoxy-β-phenylpropiophenone

1991 ◽  
Vol 69 (12) ◽  
pp. 2053-2058 ◽  
Author(s):  
R. Boch ◽  
C. Bohne ◽  
J. C. Netto-Ferreira ◽  
J. C. Scaiano
Keyword(s):  
Charge Transfer ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Nanosecond Laser ◽  
Methyl Substitution ◽  
Intramolecular Quenching ◽  
Conformational Preferences ◽  
Key Words Laser ◽  
Nanosecond Laser Flash Photolysis

The photochemistry of several methyl-substituted p-methoxy-β-phenylpropiophenones (1–5) has been examined by nanosecond laser flash photolysis using 337-nm laser excitation. The ketone triplets decay by intramolecular β-aryl quenching of the carbonyl in a well-known process that is believed to involve charge transfer. Surprisingly, methyl substitution at the β-methylene group, which is not a participant in the deactiviation mechanism, causes a dramatic decrease in the triplet lifetime; the effect is attributed to different conformational preferences in ketones 1–3 and is rationalized on the basis of MMX calculations. Methyl substitution in the β-aryl ring affects the ease of oxidation of this ring and as a result induces changes in the kinetics for intramolecular charge transfer. This conclusion is further supported by electrochemical studies of ketones 1, 4, and 5. Key words: laser flash photolysis, triplet ketones, intramolecular quenching, charge transfer.

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