Far-Infrared Matrix and Solution Spectra and Solid-State Vibrational Spectra of Niobiumpentachloride

Abstract

Far‐infrared spectra of niobiumpentachloride in the solid state, in several organic solvents, and in matrices of nitrogen (5°K) and cyclohexane (77°K) have been measured between 650 and 40 cm⁻¹. Furthermore the Raman spectrum of single‐crystal NbCl₅ has been studied. Assignments for both the monomer and the dimer molecule vibrational spectra are given, based on observed spectra and normal‐coordinate analyses. Explanation is presented for apparent coincidences observed in vibrational spectra of the solid. Thermodynamic functions of the monomeric NbCl₅ are calculated from the vibrational spectra.