Abstract

The matrix influence on the diffuse reflectance spectra of K<sub>2</sub>CrO<sub>4</sub> and Ag<sub>2</sub>CrO<sub>4</sub> has been studied spectroscopically and colorimetrically. Oxide matrices (MgO, BaO, Li<sub>2</sub>CO<sub>3</sub>) were found to be inert towards the studied compounds. In halide matrices, the symmetry decrease of the tetrahedral CrO<sub>4</sub><sup>2-</sup> ion was observed through the appearance of the symmetry-forbidden transitions and intensity reversal. A bathochromic shift of the bands, in comparison to the results for K<sub>2</sub>CrO<sub>4</sub>, was found in the Ag<sub>2</sub>CrO<sub>4</sub>/Ag<sub>2</sub>SO<sub>4</sub> system. It is explained under the assumption of strong cationanion interaction in the latter. On the basis of the color parameters, the halide matrices can be ordered according to their inertness towards K<sub>2</sub>CrO<sub>4</sub>. The quantitative relationship between the matrix effect and the molecular size of the host lattice components is given for K<sub>2</sub>CrO<sub>4</sub>.

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