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The ν1, fundamental of NF3 at 1032 cm−1 has been investigated by Fourier transform (FT) spectroscopy (1295 transitions; J, K up to 43, 41, respectively) and with the saturation technique using CO2 laser side bands as a tunable infrared source. In the latter case, 158 transitions between J = 2 and J = 41 have been observed, with a resolution of 250 kHz and an absolute accuracy of ±200 kHz. The FT spectrum was calibrated using the saturation dips as a frequency standard. From a combined fit the transition frequency has been determined to ν0 = 1032.001 237 50(47) cm−1. All measured lines are available for use as a secondary standard in the 1000 – 1060 cm−1 region.

Jürgen Schatz3, Frank Schildbacha, Axel L en tzb, Sylvia R a stä tte rb, Joachim Schilling5, Jö rg D o rm an n c, A n d reas R uoffc, and Tony D eb ae rd em ae k erd The inclusion complexes formed from carbon disulfide and /?-r£7-r-butylcalix[4]arene ( 1 C S 2) or /?-rm-butylcalix[6]arene (2-C S2) were investigated by X-ray crystal structure analysis, infrared (IR) and Raman spectroscopy. The complex 1 C S 2 crystallises in the space group P4/n, 2 C S 2 in the space group P2xln. In case of /?-rm-butylcalix[4]arene as host the carbon disulfide molecule is included in the cavity. In the crystal structure of p-rm -butylcalix[6]arene clathrate, self-com plexation o f one rm-butyl group in the cavity o f another calix[6]arene can be observed. Due to inclusion, the symmetry of CS2 is lowered both in the prm -butylcalix[4]arene and p-rm-butylcalix[6]arene case causing significant shifts in the fully assigned infrared and Raman spectra.