Polymethine Dyes

Polymethine Dyes

 

organic compounds containing a chain composed of an odd number of methine groups, =CH—, with conjugated double bonds; general formula, X (CH=CH)nCH=Y, where X and Y are groups containing atoms of N, O, or S, and n= 1–5. Some of the methine groups usually form heterocycles or aromatic residues. Polymethine dyes are fast and have bright and rich colors. They increase the photosensitivity of silver bromide and are widely used in photography. Many cationic polymethine dyes are also used in dyeing polyacrylonitrile fibers. One of the simplest polymethine dyes used in photography has the structure

REFERENCES

Chekalin, M. A., B. V. Pesset, and B. A. Ioffe. Tekhnologiia organiches-kikh krasitelei i promezhutochnykh produktov. Leningrad, 1972.

M. A. CHEKALIN

References in periodicals archive ?
Some modern hematology analyzers have embraced the basic techniques of flow cytometry, using highly-specific polymethine dyes to adapt that sophisticated technology to the high volume and automation requirements of the clinical lab.
Sysmex technology uses proprietary polymethine dyes that have an affinity to, and fluorescently label, nucleic acids.
Both use fluorescent flow cytometry and advanced cell-counting methods, coupled with polymethine dyes, to offer a complete blood count and fully automated reticulocyte results.