Effect of electron scavengers to reduce the ionization current of photoexcited N,N,N',N'-tetramethyl-p-phenylenediamine in nonpolar organic liquids

Journal Article · Thu May 27 04:00:00 EDT 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100208a016· OSTI ID:6803418

Lee, K; Lipsky, S

The effects of perfluoro-n-hexane, perfluoro-n-heptane, perfluoromethylcyclohexane, and perfluorodecalin to reduce the ionization current of photoexcited N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) have been studied in the solvents tetramethylsilane, 2,2-dimethylbutane (2,2-DMB), isooctane, cyclohexane, n-hexane, and n-pentane. Results are reported over a range of excitation energies from 5.2 to 6.7 eV and, for selected systems, over a temperature range from -78 to 25/sup 0/C. At quencher concentrations, c/sub q/ less than or equal to 0.2 M, the ratio of the photocurrent without quencher, J/sub 0/, to that with quencher, J, is found to be concave upward, linear, or concave downward in its dependence on c/sub q/, depending on the system studied. At higher c/sub q/, J/sub 0//J is always concave upward. Both J/sub 0/ and J increase to about the same extent as the excitation energy increases, thus maintaining J/sub 0//J constant. As the temperature increases, J increases somewhat more rapidly than does J/sub 0/ and increasingly so the larger is c/sub q/. An attempt is made to explain these results with a model based on interaction of the quencher with an epithermal electron.

• Research Organization: Univ. of Minnesota, Minneapolis
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6803418
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:11; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ALKANES
AMINES
AROMATICS
CYCLOALKANES
CYCLOHEXANE
DATA
EXPERIMENTAL DATA
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HEXANE
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
IONIZATION
LOW TEMPERATURE
MEDIUM TEMPERATURE
NUMERICAL DATA
OCTANE
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PENTANE
PHOTOIONIZATION
SCAVENGING
SCINTILLATION QUENCHING
SILANES
SILICON COMPOUNDS
SOLVENT PROPERTIES
TEMPERATURE DEPENDENCE