Molecular Structure of PClF4: Infrared Spectrum, Low-Temperature Raman Spectrum, and Gas-Phase Dipole Moment: Pentacoordinated Molecules. IX

Abstract

The vapor‐state infrared spectrum (2000–250 cm⁻¹) and liquid‐state Raman displacements (Δv=50–1200 cm⁻¹) of PClF₄ are reported. The vapor‐state electric dipole moment of PClF₄ was obtained from a study of the temperature variation of the dielectric constant over the range −68° to −2°. The resulting value is 0.78±0.01 D. The induced polarization is 13.7±0.4 cc. Interpretation of the vibrational data as well as the dielectric data and ³⁵Cl pure quadrupole resonance frequency support the conclusion that the structure of PClF₄ is a trigonal bipyramid (C_2v point group) with the chlorine atom located at an equatorial site.