The di-, tetra-and hexamethinemerocyanines derived from di-, tri-and tetranitrofluorene, containing heterocyclic indolylidene residue were synthesized and their absorption spectra …
The vinylogical series of anionic polymethine dyes based on tris (2, 2, 3, 3, 4, 4, 5, 5- octafluoropenthyl)-9H-fluorene-2, 4, 7-trisulfonate is synthesized. It is shown that, in contrast …