Title: Quinaldine Red
CAS Registry Number: 117-92-0
CAS Name: 2-[2-[4-(Dimethylamino)phenyl]ethenyl]-1-ethylquinolinium iodide
Additional Names: 2-[p-(dimethylamino)styryl]-1-ethylquinolinium iodide; 2-(p-dimethylaminostyryl)quinoline ethiodide; a-(p-dimethylaminophenylethylene)quinoline ethiodide
Manufacturers' Codes: Eastman no. 1361
Molecular Formula: C21H23IN2
Molecular Weight: 430.33
Percent Composition: C 58.61%, H 5.39%, I 29.49%, N 6.51%
Literature References: Prepd by condensing quinaldine ethyliodide and p-dimethylaminobenzaldehyde in alc in the presence of piperidine: König, J. Prakt. Chem. [2] 86, 172 (1912); DE 294744; Frdl. 14, 735.
Properties: Very dark red powder. Sparingly sol in water. Freely sol in alcohol, giving a dark red soln. Solns are slowly dec by light. pKb 11.25. Colorless at pH 1.4; red at pH 3.2. In the presence of chlorides the transition interval is from pH 1.2 to pH 3.0.
pKa: pKb 11.25
Use: As an indicator. |