Polymethine Dyes

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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


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


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The wide use of polymethine dyes is caused by their properties.
Particularly for application in dye-sensitized solar cells (DSCs), only a few dye classes with appropriate molecular design are known to be viable NIR absorbers: squaraine dyes, croconine dyes, diketopyrrolopyrrole derivatives, and polymethine dyes with a single absorption maximum, [[lambda].sub.max], above 700 nm.
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.
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.