Dicyanine, 3067
1-Ethyl-2-[3-(1-ethyl-2-methyl-4-(1H)-quinolinylidene)-1-propenyl]-4-methylquinolinium iodide;
1-ethyl-2-[3-(1-ethyl-4(1H)-quinaldylidene)prpenil]lepidinium iodide;
1-ethyl-2-[3-(1-ethyl-2-methyl-4-(1H)-quinolylidene)propenyl]-4-methylquinolinium iodide;
2',4-dimethyl-1,1'-diethyl-2,4'-carbocyanine iodide, C27H29IN2;
mol wt 508.44 C:63,78%, H:5.75%, I:24.96%, N:5.51% Prepn by J. A. Aeschlimann as reported by
Mills, Odams, J. Chem. Soc. 125, 1920 (1924). See also Beilstein, 2nd suppl, Vol 33, p 284
Olive-green crystals with metallic sheen from methanol. Crystals are usually solvated.
Drying at 110o expels methanol of crystn.
Decomp 244-252o. Absortion max (methanol): 603.5, 655.5nm (A1cm 63, 218). Soly in methanol: about 2%. Methanol solns appear deep blue when viewed under incident daylight. Soly in water about 0.2%. Aqsolns are dichroic and may appear brownish green.
Also sol in abs ethanol (0.5%), in ethylene glycol (1.5%), and in Cellosolve (2.0%). Practically insol in benzene, xylene.
USE: In Color photography (sensitizer for extreme reds). In optical filters for visualizing infrared radiations and magnetic fieads. Has photoconductive properties that increase sharply with a rise in temp and is classed as an O2-photoconductor: Meier, z. phys. Chem. (Leipzig) 208, 325 (1958). Gives a color reaction with magnesium ions: Babenko, Zhur. Anal. Khim. 13, 496 (1958).
Diagnostic stain for cytodiagnosis of ruptured fetal membranes.
THE MERCK INDEX * NINTH EDITION - page 408
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