15min:

N. R. WALKER, D. HIRD, School of Chemistry, Bedson Building, Newcastle University, Newcastle-upon-Tyne, NE1 7RU, U.K.; A. C. LEGON, School of Chemistry, University of Bristol, Bristol, BS8 1TS, U.K..

The rotational spectra of two isotopologues of N₂ ICF₃ have been measured between 7 and 18.5 GHz by chirped-pulse Fourier transform microwave spectroscopy. The rotational constant, B ₀, the centrifugal distortion constants, D _ J and D _ JK , and the nuclear quadrupole coupling constant of ¹²⁷I are precisely determined for isotopologues containing ¹⁴N₂ and ¹⁵N₂ respectively. The complex is a symmetric top and contains a linear arrangement of C, I, N(1) and N(2) atoms. The length of the halogen bond between N(1) and I will be presented. Experiments which exploit a Balle-Flygare FTMW spectrometer are currently in progress to determine the nuclear quadrupole coupling constants of the ¹⁴N nuclei.