FIELD: chemistry.
SUBSTANCE: invention relates to use of a compound of general formula (A), in which X: O or S; Q: 
R1: -Cl, R2: -NH(CH2)nCH3, where n=3-7, or - N[(CH2)nCH3]2, where n=1-7, -NHPh, or R1=R2, R1: -NH(CH2)nCH3, where n=3-7, or - N[(CH2)nCH3]2, where n=1-3, or -NHPh, or 
R3: -CCl3, or -CF3, or -Ph-R4, where R4: -H, or -N(CH3)2, or -(CH2)5CH3, as colorless phosphors.
.
EFFECT: disclosed is use of compounds of general formula (A), soluble in organic solvents that do not absorb in the visible spectrum, fluorescing in the region from white to orange.
1 cl, 2 tbl, 22 ex
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