FIELD: chemistry.
SUBSTANCE: described are symmetrical cyanine dyes with terminal nitrogen-containing groups in N-substitutes of heterocyclic residues of formula (I): 
where Q is a sulphur atom, CMe2 group; R1-R4 denote hydrogen, lower alkyl, lower alkoxyl group, R1 and R2 or R3 and R4 together form a C4H4 - benzo group; n=0-3; A is (CH2)mNH3 +E" or a phthalimidoalkyl group; E is Br, I, ClO4, PF6, BF4, TsO, MeSO3, CF3SO3, MeOSO3. Said compounds are obtained by reacting a quaternary salt of a 2-methyl derivative of a heterocyclic base with an electrophilic agent which is a donor in central fragments of a polymethine chain of high purity with output of up to 93%.
EFFECT: novel dyes have intense luminescence in the visible and near-infrared spectral regions in the 475-820 nm range.
3 cl, 1 dwg 1 tbl, 17 ex
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