Methine dyes (polymethine dyes) are dyes whose chromophoric system consists of conjugated double bonds (polyenes) flanked by two end groups: an electron acceptor A and an electron donor D (however, A and D can be identical; in such a case the dye is said to be symmetrical).

Apr 15, 2008 · Merocyanine Dyes with Cyclic Terminal Groups General References 1 A. Weissberger : The Chemistry of Heterocyclic Compounds , vol. 18 , Wiley Interscience Publishers, New York-London 1964 .

Heptamethine dyes are a subclass of chemical compounds within the cyanine dye family and have many uses as fluorescent dyes, particularly in biomedical imaging, the development of theranostics, the individualized treatment of cancerous patients with the aid of PDT, co-administration with other drugs, and irradiation.

Polymethines are compounds made up from an odd number of methine groups (CH) bound together by alternating single and double bonds. [1] . Compounds made up from an even number of methine groups are known as polyenes. Cyanines are synthetic dyes belonging to …

Jan 1, 2023 · Merocyanine dyes are polymethine dyes comprising a conjugated chain of sp 2-hybridized carbon atoms that connects a terminal nitrogen atom, where the nitrogen atom and part of the conjugated chain constitute an unsaturated heterocycle as in cyanine dyes, and the second terminal atom is either an oxygen atom, which is an exocyclic constituent of ...

Cyanine dyes are the best known poly methine dyes. Nowadays, their commercial use is limited to sensitizing dyes for silver halide photography . However, derivatives of cyanine dyes provide important dyes for polyacrylonitrile.

Oct 25, 2023 · Polymethine dyes are defined here by two criteria. First, they possess a conjugated chain of (2n + 1) sp 2 -hybridized carbon atoms that connect a terminal π-electron-accepting (π-electron withdrawing) group with a terminal π-electron-donating group.

Oct 31, 2023 · Polymethine dyes are defined here by two criteria. First, they possess a conjugated chain of (2n + 1) sp2-hybridized carbon atoms that connect a terminal π-electron-accepting (π-electron withdrawing) group with a terminal π-electron-donating group.

Oct 1, 2015 · NIR dyes as a rule contain both conjugated substituents and different cycles in the polymethine chain. Such modifications do not change the typical “cyanine-like” shape of the spectral band, first of all, their high intensity and selectivity.

Apr 15, 2008 · In current terms polymethine dyes are characterized by a conjugated chain of (2n + 1) sp²-hybridized carbon atoms that connects a terminal π-electron accepting group and a terminal π-electron...