Showing papers on "DPPH published in 1975"
TL;DR: The authors showed that the catalytic site is probably Cr(V) which is difficultly reducible because of some special structural feature of the macroporous chromias and showed that CrV is an intermediate which reaches a maximum concentration of at least 9% and then declines.
23 citations
TL;DR: In this paper, the use of DPPH as a standard for the measurement of G-values was discussed, and the authors proposed a method to improve the accuracy of the measurement.
Abstract: (1975). The use of DPPH as a standard for the measurement of G-values. Radiation Effects: Vol. 27, No. 1-2, pp. 111-112.
14 citations
TL;DR: In this paper, the reaction of 2,2-diphenyl-1-picrylhydrazyl (DPPH) with 2,4,6-tri-t-butylbenzenethiol (TBBT) in benzene solution has been studied.
Abstract: The reaction of 2,2-diphenyl-1-picrylhydrazyl (DPPH) with 2,4,6-tri-t-butylbenzenethiol (TBBT) in benzene solution has been studied. The two major products, 2,2-diphenyl-1-picrylhydrazine (DPPH-H) ...
8 citations
TL;DR: In this article, the electrical properties of 2,2-diphenyl-1-picrylhydrazyl (DPPH) disk were studied in the temperature range 18-60°C over frequencies 3×10-3×106 Hz.
Abstract: The electrical properties of 2,2-diphenyl-1-picrylhydrazyl (DPPH) disk were studied in the temperature range 18–60°C over frequencies 3×10–3×106 Hz in comparison with those of 1,1-diphenyl-2-picrylhydrazine (DPPHn). The frequency dependence of conductance (σac) for both DPPH and DPPHn can be explained in terms of the hopping conduction caused by localized states and/or shallow traps. At low frequencies, the strong dispersion of the capacitance of DPPH was observed while conductivity remained constant. This was accounted for by hyperelectronic polarization. The difference in electrical properties between DPPH and DPPHn indicates that the unpaired electrons in DPPH play an important role in the frequency independent conductance (σdc), but not in the frequency dependent conductance (σac).
2 citations
TL;DR: In this paper, the reaction of 2,2-diphenyl-1-picrylhydrazyl (DPPH) with 2,4,6-tri-t-butylbenzenethiol (TBBT) in benzene solution has been studied.
Abstract: The reaction of 2,2-diphenyl-1-picrylhydrazyl (DPPH) with 2,4,6-tri-t-butylbenzenethiol (TBBT) in benzene solution has been studied. The two major products, 2,2-diphenyl-1-picrylhydrazine (DPPH-H) ...
TL;DR: In this paper, the electrical properties of 2,2-diphenyl-1-picrylhydrazyl (DPPH) disk were studied in the temperature range 18-60°C over frequencies 3×10-3×106 Hz.
Abstract: The electrical properties of 2,2-diphenyl-1-picrylhydrazyl (DPPH) disk were studied in the temperature range 18–60°C over frequencies 3×10–3×106 Hz in comparison with those of 1,1-diphenyl-2-picrylhydrazine (DPPHn). The frequency dependence of conductance (σac) for both DPPH and DPPHn can be explained in terms of the hopping conduction caused by localized states and/or shallow traps. At low frequencies, the strong dispersion of the capacitance of DPPH was observed while conductivity remained constant. This was accounted for by hyperelectronic polarization. The difference in electrical properties between DPPH and DPPHn indicates that the unpaired electrons in DPPH play an important role in the frequency independent conductance (σdc), but not in the frequency dependent conductance (σac).