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Microwave Spectra of the Methylcyanopolyynes CH3(CC)nCN,n= 2, 3, 4, 5

✍ Scribed by Wei Chen; J.-U. Grabow; M.J. Travers; Michaeleen R. Munrow; Stewart E. Novick; M.C. McCarthy; P. Thaddeus

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
194 KB
Volume
192
Category
Article
ISSN
0022-2852

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✦ Synopsis

The ground state rotational spectra of four methylcyanopolyynes CH 3 (C'C) 2 CN, CH 3 (C'C) 3 CN, CH 3 (C'C) 4 CN, and CH 3 (C'C) 5 CN were measured between 6 and 22 GHz by Fourier transform microwave spectroscopy. For CH 3 (C'C) 2 CN, previously observed by Alexander et al. [J. Mol. Spectrosc. 70, 84 -94 (1978)] eight transitions were observed, each with sufficient resolution to determine the nitrogen quadrupole hyperfine constant for the first time: eqQ ϭ Ϫ4.25(3) MHz. The longer three methylcyanopolyynes are new; for these, from 10 to 21 rotational transitions were detected and precise values for the rotational and the leading centrifugal distortion constants, and eqQ for CH 3 (C'C) 3 CN, were determined.

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