Authors: T.G. Cherkasova, E.V. Cherkasova, V. Cherkasov

Title of the article: Structures of double complex salts with thermochromic properties

Year: 2017, Issue: 3, Pages: 175-182

Branch of knowledge: Chemical technology

Index UDK: 54-386: [546.651.66.763]: 547-318.826.3

DOI: -

Abstract: The double complex compounds - hexa(isothiocyanate)chromates (III) of lanthanide (III) complexes with ε-caprolactam and nicotinic acid [Ln(ε C6H11NO)8][Cr(NCS)6] and [Ln(C5H5NCOO)3(H2O)2][Cr(NCS)6]•nH2O, n=1,2 - were produced from the aqueous solutions by means of direct synthesis. The substances are studied by the spectroscopic method; their crystal structures were determined. It is found that all the complexes are of island ionic type. ε-C6H11NO complexes form triclinic system crystals - space group P¯1, or monoclinic - space group С2/с. The nicotinic acid compositions crystallize in the monoclinic system, space group P21/n. The complexes have reversible heat-sensitive properties and can serve as the chemical sensors in the temperature-sensitive devices that are used for visual thermal control in various technological processes.

Key words: Double complexes rare-earth elements hexaisothiocyanatochromates(III) compositions crystal structures nicotinic acid ε-caprolactam

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