Crystal Structures of Binuclear Coordination Rare-Earth Metal Compounds

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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)6nH2O, n=1,2 - were produced from the aqueous solutions by means of direct synthesis. The substances are studied by the spectroscopic method; their crystal structure is 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 inspection of the thermal regime in various technological processes.

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