Authors: T.G. Cherkasova, E.V. Cherkasova, A.V. Tikhomirova, Bulanova , Yu.R. Giniyatullina, E.S. Tatarinova

Title of the article: Mixed ligand binuclear complexes of some transition and rare earth metals

Year: 2019, Issue: 2, Pages: 51-57

Branch of knowledge: 05.17.02 Technology of rare, scattered and radioactive elements

Index UDK: 54-386:546:[65.494.662.712.732.742.763]:547-318.544.2.826.3

DOI: 10.26730/1999-4125-2019-2-51-57

Abstract: Double complex compounds (DCC) of manganese(II), cobalt(II), nickel(II), cadmium(II) and rare-earth metals(III) are investigated) with rodano - and iodomercurate - and hexafluorosilicate ions, on the basis of which it is possible to obtain compounds with ionic and polymer structures, as well as various physical and chemical properties. The conditions for the synthesis of these compounds at pH values close to neutral from aqueous solutions at the calculated molar ratios of the initial components are developed. The structure of the obtained double complex salts was studied by IR spectroscopic, X-ray, thermal methods. The density, electrical conductivity of solutions, and magnetic characteristics of substances were determined. The obtained coordination compounds exhibit thermochromic properties. The color of compounds of rare earth elements (REE) with hexa(isothiocyanato)chromate(III)-ion reversibly changes from pink to dark green, the remaining DCS exhibit irreversible thermochromism. In addition, DCC are promising precursors for the creation of high dispersion oxide powders by thermal decomposition of double complex compounds in air at relatively low temperatures. These systems have improved performance and are used in various fields of technology. In addition, the magnetic properties of substances, which include two paramagnetic ions, are of interest.

Key words: double complex compounds manganese(II) cobalt(II) nickel(II) cadmium(II) mercury(II) rare earth metals(III) chromium (III) dimethyl sulfoxide ε-caprolactam nicotinic acid

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