| Abstrakt: |
Rotational spectra of the five isotopomers HC14N...35ClF, HC14N...37ClF, DC14N...35ClF, HC15N...35ClF and HC15N...37ClF of a complex of hydrogen cyanide and chlorine monofluoride were observed with a pulsed nozzle, Fourier transform microwave spectrometer. The component gases were brought together in a fast-mixing nozzle to preclude mutual chemical reaction. Groundstate spectroscopic constants B0, DJ, chi aa(14N), chi aa(Cl) and M bb(Cl) are reported. Interpretation of the spectroscopic constants with the aid of various models has led to the conclusions that HCN...ClF is a linear molecule with nuclei in the order shown, that when HCN achieves its equilibrium position in the complex the electric perturbation of ClF is equivalent to a migration of a fraction delta 0.04 of an electronic charge from Cl to F, and that the complex is weakly bound according to the magnitude (k sigma = 12.3 N m-1) of the intermolecular stretching force constant. From a comparison of the family of complexes HCN...XY, where XY = ClF, BrCl and Cl2, it is concluded that all three can be described as Mulliken complexes of the weak, outer type. [ABSTRACT FROM AUTHOR] |
