Matrix-isolation studies on molecular K2CrO4, K2MoO4, and K2WO4

Abstract

The results of a matrix-isolation i.r. spectroscopic study on the vaporisation of the title compounds are described. When these materials are heated in vacuo and the products condensed in low-temperature matrices, the i.r. spectra obtained show the presence of the corresponding molecular species, together with a number of minor features. Oxygen-18 enrichment experiments establish a D_2d geometry for K₂WO₄, and high-resolution spectra on the iso-structural species K₂CrO₄ and K₂MoO₄ provide an estimate of bond angles in these molecules from metal isotope frequency shifts.