Matrix Infrared and Laser Raman Spectra, Molecular Structures and Normal Coordinate Analyses of Germanium Difluoride, Monomer GeF₂, and Dimer (GeF₂)₂

Abstract

Matrix infrared and laser Raman spectra are reported for GeF 2 and (GeF 2 ) 2 in both N 2 and Ar matrices. Raman depolarization measurements for the monomer in N 2 matrices identify ν 1 at 653 cm −1 . Warm-up experiments identify infrared and Raman lines at 665, 478 cm −1 and 669, 465, and 424 cm −1 respectively, with the first stage of the polymerization of GeF 2 monomer and are assigned to GeF stretching modes of the dimer (GeF 2 ) 2 , having a centrosymmetric C 2h , non-planar structure, containing a double fluorine bridge similar to the structure proposed for (SeO 2 ) 2 . A normal coordinate analysis is performed on the dimer using a force field transferred from the monomer. The results provide additional evidence for the correctness of the vibrational and stereochemical assignments for the dimer.