Abd El-Aal, R. M. published the artcileSynthesis and physicochemical studies of some new quinolinoxazine pentamethine cyanine dyes, Quality Control of 606-55-3, the publication is Arabian Journal of Chemistry (2017), 10(1), 82-90, database is CAplus.
Polymethine cyanine dyes belong to a well-known class of organic compounds, which have been used in photog. and as information storage in laser technol. A series of novel cyanine dyes were synthesized through the formylation of quinolinium[b,c]1,4-oxazine-chloride salt 1. Reaction of compound 2-chloro-3-formyl-quinolinium[b,c]1,4-oxazine-chloride salt 2 with different molar ratios of 2(4)-Me substituted heterocyclic in basic catalysis afforded the corresponding 2-chloroquinolinium[b,c]1,4-oxazine-chloride salt-3[2(4)]-dimethine (3a-c), quinolinium[b,c]-1,4-oxazinechloride salt-2,3[2(4)]-pentamethine (4a-c) and quinolino[b,c]1,4-oxazine-6yl[2(4)]-monomethine-/2,3[2(4)]-pentamethine cyanine dyes (5a-c) resp. The structure of the dyes was characterized by elemental anal., visible absorption, fluorescence emission, IR, 1H-NMR and mass spectroscopy. A comparison of the visible absorption maxima between compounds 3b, 4b and 5b showed that asym. mono-pentamethine cyanine dye 5b reveals a bathochromic shift than both dimethine 3b and pentamethine cyanine dyes 4b. The absorption spectra of dyes were investigated in organic solvents. The results indicated that the excitation for their color is a simple charge-transfer from oxygen atom of oxazine nucleus and/or nitrogen atom of pyridine (quinoline) nucleus to N-quaternary salts in di-, penta- and mono-/pentamethine cyanine dyes resp. These dyes showed pos. solvatochromism with increased solvent polarity.
Arabian Journal of Chemistry published new progress about 606-55-3. 606-55-3 belongs to iodides-buliding-blocks, auxiliary class Quinoline,Salt, name is 1-Ethyl-2-methylquinolin-1-ium iodide, and the molecular formula is C12H14IN, Quality Control of 606-55-3.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com