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79Br-Nuclear quadrupole coupling in the rotational spectrum of HC15N⋯D79Br: determination of the H(D)Br oscillation amplitudes and force constant

✍ Scribed by A.C. Legon

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
478 KB
Volume
140
Category
Article
ISSN
0009-2614

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✦ Synopsis

The ground-state rotational spectrum of the linear, hydrogen-bonded isotopomer HC'5N...D79Br has been investigated by pulsednozzle Fourier-transform microwave spectroscopy to give the spectroscopic constants &= 1374.4429( 3) MHz, D,= 1.790( ) kHz, x( 79Br) =438.645( 9) MHz and M( 79Br) =2.4( 3) kHz. The HBr subunit oscillation amplitudes /3: = 15.069( 8) o and 8: = 12.726( 7) O, determined by combined use ofX( 79Br) for HC'5N...H19Br and HC'5N...D79Br, lead to the HBr oscillation force constant kBP=6.93(2) x 10-" J rad-'. The variation of kBB with k, is considered for the series B...HX, where B=CO, PH3, HCN and X = Cl or Br.

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