FIELD: chemistry.
SUBSTANCE: invention relates to the field of chemistry, namely to new reversible color indicators, and can be used to indicate and visually monitor the temperature and the temperature fields in various technological processes. Declared a reversible color indicator of temperature based on a double complex salt – hexa(isothiocyanato)chromate(III)-diaquatrix(nicotinic acid)cerium (III) dihydrate, that has a reversible color change when heated, and the composition in the first variation is characterized by the chemical formula [Ce(C6H5NO2)3(H2O)2][Cr(NCS)6]⋅2H2O with color change when heated to temperature of 100 °C and the second – [Lu(C6H5NO2)3(H2O)2][Cr(NCS)6]⋅2H2O with color change when heated to 110 °C.
EFFECT: creation of new reversible color heat indicators based on hexa(isothiocyanato)chromate(III)diaquatrix(nicotinic acid)cerium (III) and lutetium(III) dihydrates, having the ability to reversibly change color when heated to temperatures of 100 and 110 °C for complexes of cerium(III) and lutetium(III), respectively, available in the preparation and easy to use in practice.
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