Abstract

Phase equilibria in the RbCl–CoCl2·2H2O–H2O system were investigated, single crystals of double rubidium–cobalt chloride dihydrate were obtained, and its structure and optical properties were studied. The regions of crystallization of compounds in the three-component system under study were delimited. Rb2CoCl4·2H2O crystals were grown by controlled decrease in the temperature of a saturated aqueous solution. Using X-ray diffraction analysis, the crystal lattice parameters of Rb2CoCl4·2H2O were obtained and the structure of the crystals was refined. The spectral characteristics of the obtained crystals and the corresponding aqueous solution were studied in the λ range 200–800 nm.

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