The Photochemical Oxidation of Oxalic Acid Sensitized by Ferric Ion.

Livingston, Robert

doi:10.1021/j150401a006

Cited by 17 publications

(15 citation statements)

References 6 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[92][93][94][95] Yet the formation and decay rates of the excited states and intermediate species have not been reported at least in the fs and ps time regime, even though the quantum yield of the electron transfer has been investigated in depth and is used for actinometry. 96 The mechanism of this process has been studied by both steady state and pulsed irradiation and the data obtained suggest that the quantum yield for the formation of Fe(II) exceeds 1.0 when the sample is excited with 250-400 nm light.…”

Section: A Electron Transfer In Metal Complexesmentioning

confidence: 99%

Ultrafast time resolved x-ray diffraction, extended x-ray absorption fine structure and x-ray absorption near edge structure

Chen

Rentzepis

2012

Journal of Applied Physics

View full text Add to dashboard Cite

Ultrafast time resolved x-ray absorption and x-ray diffraction have made it possible to measure, in real time, transient phenomena structures and processes induced by optical femtosecond pulses. To illustrate the power of these experimental methods, we present several representative examples from the literature. (I) Time resolved measurements of photon/electron coupling, electron/phonon interaction, pressure wave formation, melting and recrystallization by means of time resolved x-ray diffraction. (II) Ultrafast x-ray absorption, EXAFS, for the direct measurement of the structures and their kinetics, evolved during electron transfer within molecules in liquid phase. (III) XANES experiments that measure directly pathway for the population of high spin states and the study of the operating mechanism of dye activated TiO2 solar cell devices. The construction and use of novel polycapillary x-ray lenses that focus and collimate hard x-rays efficiently are described.

show abstract

Section: A Electron Transfer In Metal Complexesmentioning

confidence: 99%

Ultrafast time resolved x-ray diffraction, extended x-ray absorption fine structure and x-ray absorption near edge structure

Chen

Rentzepis

2012

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…[24][25][26][27] Yet the mechanism for the formation and decay of the excited states and intermediate species has not been reported at least in the fs and ps time regime, even though the quantum yield for the photo redox reactions has been investigated in depth and is used for chemical actinometry. 28 The mechanism of this redox process has been studied by flash photolysis at various pH values and concentrations and both steady state and pulsed irradiation experiments suggest that the quantum yield for the formation of Fe(II) exceeds 1.0 at 250-400 nm.…”

Section: Photochemistry Of Metal Oxalatementioning

confidence: 99%

Electron Transfer in Metal‐Organic Molecules. A Time Resolved EXAFS and Optical Spectroscopy Study

Chen

Rentzepis

2011

J Chinese Chemical Soc

View full text Add to dashboard Cite

We have measured, by means of ultrafast x-ray absorption and optical spectroscopy, the M-O (M=Fe, Co) and Co-N metal to ligand bond length change as a function of time and the formation and decay of the excited states and intermediate species, after excitation with a 267 nm femtosecond pulse. These experimental data combined with DFT calculations allowed us to determine the mechanism of electron transfer operating in the redox reaction of two metal-ligand complexes, [M(III)(C 2 O 4 ) 3 ] 3-and [Co(III)(NH 3 ) 6 ] 3+ . Based on the data we find that, even though both molecules are excited into their charge transfer band, the redox reaction of [M(III)(C 2 O 4 ) 3 ] 3-proceeds via intermolecular electron transfer while [Co(III)(NH 3 ) 6 ] 3+ electron transfer mechanism is intramolecular.

show abstract

“…The number of iodide ions oxidized during an experiment was computed from the blank titre, the change in titre, the concentration of the blank, and the volume of the reacting solution. The quantum yield and total number of photons absorbed were computed in the usual way (10).…”

Section: Routine Procedures and Computationsmentioning

confidence: 99%

“…The optical system and reaction cell used in these measurements were similar to those described by Livingston (10).…”

mentioning

confidence: 99%

The Photoöxidation of Iodide Ion Sensitized by Eosin.

Livingston¹,

Hurd²

1941

J. Phys. Chem.

Self Cite

View full text Add to dashboard Cite

This study was begun in the hope of establishing a sound experimental basis for the theoretical interpretation of a dye-sensitized photooxidation. The system eosin and potassium iodide was chosen, since it was known to give a conveniently rapid reaction ( 14) and could be studied by the ordinary methods of analytical chemistry. To avoid uncertain corrections for internal filter action ( 14) and for photosensitization by I3~(1), a small known amount of sodium arsenite was added to the reacting mixtures to prevent the accumulation of I3~( 6). The extent of the reaction was determined by titrating the remaining arsenite with standard iodine solution.Quantitative measurements were made of the effect upon the quantum yield of the dye concentration, the iodide-ion concentration, the pH, the intensity of the absorbed light, and the rate at which oxygen was supplied. It was also determined that there is no detectable (permanent) bleaching of eosin when its solution, containing arsenite and iodide, is illuminated in the absence of oxygen. EXPERIMENTAL PROCEDURE MaterialsThe eosin was purified by precipitating it with dilute hydrochloric acid, washing it, dissolving it with an equivalent amount of base, and crystallizing it from the resulting solution. All other reagents were of "analytical grade" and were used without further purification. Conductivity water was used in preparing all solutions. Analytical methodsThe end point of the iodine-arsenite titration was determined by the polarized-electrode method of Foulk and Bowden (3), the titration being performed in red light to avoid photochemical action. A calibrated microburet was used in all titrations. ApparatusThe light source was a water-cooled quartz-capillary mercury arc of the atmospheric-pressure type (7). Glass color filters and some of the 1 This work was presented by Frank Hurd to the Faculty of the Graduate School of the University of Minnesota in partial fulfilment of the requirements for the degree of Doctor of Philosophy, December, 1939.

show abstract

The Photochemical Oxidation of Oxalic Acid Sensitized by Ferric Ion.

Cited by 17 publications

References 6 publications

Ultrafast time resolved x-ray diffraction, extended x-ray absorption fine structure and x-ray absorption near edge structure

Ultrafast time resolved x-ray diffraction, extended x-ray absorption fine structure and x-ray absorption near edge structure

Electron Transfer in Metal‐Organic Molecules. A Time Resolved EXAFS and Optical Spectroscopy Study

The Photoöxidation of Iodide Ion Sensitized by Eosin.

Contact Info

Product

Resources

About