Infrared spectra of matrix-isolated species; reaction products of MgF2 with group–I and group–II fluorides

Abstract

Infrared spectra of MgF₂ vapour co-deposited with vapours of alkali metal fluorides, LiF, NaF, KF and CsF and alkaline earth difluorides, CaF₂ and SrF₂, in argon matrices at liquid helium temperatures are reported in the range 400–1000 cm^–1. New frequencies are identified as belonging to mixed fluorides MMgF₃ and M′MgF₄. The frequencies are tentatively assigned to these species assuming a planar cyclic structure of C_2v symmetry. A correlation with the spectrum of the dimer Mg₂F₄ of D_2h symmetry is presented.