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High-resolution infrared and microwave study of the ν20 and ν21 levels near 300 cm−1 in 1,2,4-triazine

✍ Scribed by F. Hegelund; R. Wugt Larsen; B. Nelander; D. Christen; M.H. Palmer

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
314 KB
Volume
217
Category
Article
ISSN
0022-2852

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✦ Synopsis

The gas phase far-IR spectrum of the m 20 (A 00 , 367.88 cm À1 ) and m 21 (A 00 , 311.28 cm À1 ) bands of 1,2,4-triazine, a five membered ring having the point group C s , has been studied at a resolution ranging from 0.002 to 0.003 cm À1 . From the MW spectrum 58 transitions in the m 20 level and 64 in the m 21 level have been assigned. The m 20 and m 21 modes which are due to non-planar motions of the ring system are found to be nearly unperturbed. From a simultaneous analysis of IR and MW transitions band centers, rotational constants, and the quartic centrifugal distortion constants D

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The FTIR spectrum of PF 3 has been recorded in the 750-950 cm 01 range covering the fundamentals n 1 (891.940 5 cm 01 ) and n 3 (859.544 1 cm 01 ) and the combination band n 2 / n 4 (834.055 7 cm 01 ) with a resolution of ca. 2.5 1 10 03 cm 01 . Furthermore, spectra of the 2n 2 , 2n 2 0 n 2 , (n 2 /