The 300ndash;1000hyphen;cmminus;1spectra of KMnO4embedded in KCl, RbCl, KBr, and RbBr pellets have been recorded at about 40deg;C and at liquidhyphen;nitrogen temperature in the concentration range 1/100 to 1/6000 molar ratios. In the chloride pellets, the fundamental modes of permanganate show many components which obey the selection rules of the unit cell of crystalline salt. Very sharp single bands of isolated tetrahedral MnO4minus;ion occur in the spectra of bromide pellets, superimposed on the bands of crystalline permanganate. The formation of solid substitutional solutions of MnO4minus;in alkali halide pellets is discussed in relation to size and symmetry of the occupied site of the host lattice.
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