THE NEAR ULTRAVIOLET ABSORPTION SPECTRUM OF 1,2,4-TRIFLUOROBENZENE VAPOR

1957 ◽  
Vol 35 (3) ◽  
pp. 332-340 ◽  
Author(s):  
K. Narahari Rao ◽  
H. Sponer
Keyword(s):  
Absorption Spectrum ◽  
Excited State ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum ◽  
Vibrational Modes ◽  
Near Ultraviolet ◽  
Bond Stretching

The vapor spectrum of 1,2,4-trifluorobenzene at 2810–2460 Å was obtained with a 3 meter grating in an Eagle mounting. The band at 37126 cm−1 was taken as the 0–0 band of the A′—A′ transition. The excited state vibrations 698, 746, 1274, and 1369 cm−1, which are totally symmetric, appear in progressions and combinations. Their correlation to vibrational modes is discussed. The 1274 belongs to a C—F bond stretching mode. Possibilities are discussed to explain the structure of the first group upon which the spectrum is built.

The Near-ultraviolet Absorption Spectrum of Diimide in Liquid Ammonia and its Decomposition between −65 and −38 °C

1974 ◽  
Vol 52 (13) ◽  
pp. 2513-2515 ◽  
Author(s):  
R. A. Back ◽  
C. Willis
Keyword(s):  
Absorption Spectrum ◽  
Gas Phase ◽  
Room Temperature ◽  
Liquid Ammonia ◽  
Vibrational Structure ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum ◽  
First Order ◽  
Rapid Decomposition ◽  
Near Ultraviolet

The near-ultraviolet absorption spectrum of diimide in liquid ammonia at −50 °C is shifted about 500 Å to the red compared with the gas-phase spectrum, with λmax = 4000 Å. The spectrum is also broadened and the vibrational structure largely obscured. It is suggested that hydrogen bonding is responsible for these changes.Diimide is much more stable in liquid ammonia between −65 and −38 °C than in the gas phase at room temperature. A first-order decay is observed with Arrhenius parameters of A = 1.9 × 103 s−1 and E = 6.6 kcal/mol; this is always preceded by a more rapid, higher-order initial decay which may be related to the rapid decomposition observed during vaporization.

Near-Ultraviolet Absorption Spectrum of 5,10-Dihydrophenazine

1968 ◽  
Vol 22 (6) ◽  
pp. 785-786 ◽  
Author(s):  
David N. Bailey ◽  
David K. Roe ◽  
David M. Hercules
Keyword(s):  
Absorption Spectrum ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum ◽  
Near Ultraviolet
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