In the temperature range 120 to 300 O K a study has been made of the infrared absorption spectra of KC1 and KBr single crystals doped with Se0:-and Se0:-anions. It is shown that the Se0,2-anions in these matrices form complexes SeO:-. M2+ of symmetry Cp, with cations M2+ (M2' -Ca2', Sr2-, Ba") similar t o the complexes SO,"-N2+ and CrOi--M2-observed earlicr. A lowering of the local symmetry results in the splitting of VJF) vibration of the tetrahedral anion SeO:-. An identification of bands and their fine structure assumed to be isotropic was made in the infrared absorption spectra of the complex SeO2-. RIPf. The existence of similar complexes SeOi-* MZ7 was assumed in KBr and KCI lattices doped with Se0;-In connection with the quartet structure of infrared absorption spectra in the vibration region YJE) of the Se0;-anion.
In the temperature range 120 to 800 °K and frequency range 1000 to 300 cm−1 a study has been made of the infrared absorption spectra of the impurity anions WO 42−‐and MoO 42−‐in KI and CsI single crystals. It is shown that W 42− and MOO 42− form neutral complexes W 42− · M2+ and MoO 42− · M2+ in KI lattice with cations M2+ (Ca2+, Sr2+, Ba2+) similar to the complexes SO 42− · M2+, CrO 42− · M2+ and SeO 42− · M2+ observed earlier in the f.c.c. lattices. Here a lowering of the local symmetry to C2v of the impurity tetrahedrons results in the appearance of triplets in their vibration regions v3(A2) and v4(F2). The fine structure in the infrared spectrum of MoO 42− · M2+ + KI was interpreted to be isotopic. A local symmetry of the impurity WO 42− and MoO 42− in CsI lattice was not identified unequivocally from the IR absorption spectra. The latter have doublet and quartet structure in the vibration regions v1(A1) and v3(F2), respectively, and depend on the impurity tetrahedrons and M2+ cation concentration. One, probably, should assume the interstitial formation of impurities into b.c.c. lattice of CsI which results in the existence of complex anion‐cation neutral complexes of different kinds.
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