FIELD: chemistry.
SUBSTANCE: sesquihydrate hexa (isothiocyanato) chromate (III) diaquatrix (nicotinic acid) erbium (III). The composition of the indicator is characterized by the chemical formula [Er(C6H5NO2)3(H2O)2][Cr(NCS)6]⋅1.5H2O.
EFFECT: new reversible thermochromic material with the ability to reversibly change the colour when heated, available in the preparation and convenient to use in practice.
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