The detection of free radicals in the high intensity photolysis of hydrogen azide

1956 ◽  
Vol 235 (1200) ◽  
pp. 143-147 ◽  
Keyword(s):  
Free Radicals ◽  
Absorption Spectra ◽  
High Intensity ◽  
Inert Gas ◽  
Hydrogen Azide

The absorption spectra of the radicals NH and NH 2 have been observed in the flash photo­lysis of hydrogen azide in the presence of an excess of inert gas. A new complex, but slightly diffuse, absorption has been detected around 2700 Å. This spectrum shows no shift when DN 3 is substituted for HN 3 , and it is attributed to the N 3 radical. The mechanism of the hydrogen azide photolysis is discussed briefly with reference to these observations.

THE ELECTRONIC ABSORPTION SPECTRA OF DIXANTHOGENS

1961 ◽  
Vol 39 (12) ◽  
pp. 2590-2592 ◽  
Author(s):  
M. L. Shankaranarayana ◽  
C. C. Patel
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
High Intensity ◽  
Electronic Absorption Spectra ◽  
Blue Shift ◽  
Polar Solvents ◽  
Low Intensity

The electronic absorption spectra of diethyl, diisopropyl, di-n-butyl, and diisoamyl dixanthogens have been studied in polar and non-polar solvents. The compounds exhibit a low-intensity band around 365 mµ and two high-intensity bands around 285 and 242 mµ. The 365 mµ band is assigned, as a result of the solvent studies, to n → π* transition and the 285 mµ band to π → π* transition. The band around 242 mµ may be due to the n → σ* transition, since in polar solvents it shows mainly a blue shift.

Pyrolysis of Trifluoroacetaldehyde

1973 ◽  
Vol 51 (14) ◽  
pp. 2292-2296 ◽  
Author(s):  
Michael T. H. Liu ◽  
Leon F. Loucks ◽  
Robert C. Michaelson
Keyword(s):  
Thermal Decomposition ◽  
High Pressure ◽  
Free Radicals ◽  
Rate Equation ◽  
Pressure Dependence ◽  
Inert Gas ◽  
Order Process ◽  
First Order ◽  
Pressure Region ◽  
High Pressure Region

The thermal decomposition of trifluoroacetaldehyde has been studied over the 460–520 °C temperature range, and at pressures from 4 to 400 mm Hg. The experimental rate equation in the high-pressure region is of the form: Rate = k[CF3CHO]3/2 where[Formula: see text]The results are consistent with a mechanism initiated by a first order process and terminated by a second order recombination of two CF3 free radicals. At lower pressures (40 mm Hg), the ratio of kinit/kterm is pressure dependent and the overall order increases. The effects of added inert gas confirm this pressure dependence.

ABSORPTION OF PHENOTHIAZINE FROM THE RUMEN OF SHEEP, AND ITS ESTIMATION IN BLOOD SERUM

1950 ◽  
Vol 28d (3) ◽  
pp. 162-172 ◽  
Author(s):  
R. P. Harpur ◽  
O. F. Denstedt ◽  
W. E. Swales
Keyword(s):  
Free Radicals ◽  
Free Radical ◽  
Blood Serum ◽  
Absorption Spectra ◽  
Peripheral Circulation ◽  
Approximate Estimation

Under the conditions described, phenothiazine is shown to be soluble in human and sheep serum. Ultraviolet examination of serum containing phenothiazine indicates that the compound is unchanged by solution in serum. After preliminary experiments with ultraviolet analysis the visual spectra of the free radicals were found to be more suitable for the analysis of sheep serum. A method is described, which makes use of free-radical absorption spectra, for the detection and approximate estimation of phenothiazine in serum when it is present with phenothiazone. The method also allows for the detection of diphenylamine o-sulphoxide. Experiments with lambs which had been dosed with phenothiazine showed that while the peripheral circulation contained leucophenothiazone, the blood draining the rumen contained phenothiazine also.

Study of the absorption spectra of free radicals in flames

1967 ◽  
Vol 11 (1) ◽  
pp. 11-16 ◽  
Author(s):  
P.F. Jessen ◽  
A.G. Gaydon
Keyword(s):  
Free Radicals ◽  
Absorption Spectra

Absorption Spectra of Free Radicals Produced by Flash Discharges

1956 ◽  
Vol 25 (2) ◽  
pp. 372-373 ◽  
Author(s):  
L. S. Nelson ◽  
D. A. Ramsay
Keyword(s):  
Free Radicals ◽  
Absorption Spectra
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