8007. Pyronine Y

Nomenclature

CAS number: 92-32-0
3,6-Bis(dimethylamino)xanthylium chloride; N-[6-(dimethylamino)-3H-xanthene-3-ylidene]-N-methylmethanaminium chloride; [6-(dimethylamino)-3H-xanthen-3-ylidene]dimethylammonium chloride; tetramethyldiaminoxanthylium chloride; C.I. 45005; pyronine G.
C17H19ClN2O; mol wt 302.80.
C 67.43%, H 6.32%, Cl 11.71%, N 9.25%, O 5.28%.

Description and references

Prepn from dimethyl-m-aminophenol: Mohlau, Koch, Ber. 27, 2887 (1894); DE 58955; DE 59003; DE 63081 (1892 to Leonhardt); Frdl. 3, 92-94. See also: Colour Index vol. 4 (3rd ed., 1971) p 4417.

Chemical structure

Properties

Ferric chloride complex, lustrous green crystals from alc. Soly in water at 26°: 8.96% giving a red soln. Soly in alc at 26°: 0.60%. Solns show a yellowish fluorescence. Absorption max about 552 nm; curves: Stotz et al., Stain Technol. 25, 57 (1950).

Use

Bacterial and biological stain.