Rhodamine B
Title: Rhodamine B
CAS Registry Number: 81-88-9
CAS Name: 9-(2-carboxyphenyl)-3,6-bis(diethylamino)xanthylium chloride
Additional Names: N-[9-(2-Carboxyphenyl)-6-(diethylamino)-3H-xanthen-3-ylidene]-N-ethylethanaminium chloride; tetraethylrhodamine; D & C Red No. 19; C.I. Basic Violet 10; C.I. 45170
Molecular Formula: C28H31ClN2O3
Molecular Weight: 479.01
Percent Composition: C 70.21%, H 6.52%, Cl 7.40%, N 5.85%, O 10.02%
Literature References: Prepn: Colour Index vol. 4 (3rd ed., 1971) p 4420. Toxicity study: J. M. Webb et al., Toxicol. Appl. Pharmacol. 3, 696 (1961).
Properties: Green crystals or reddish-violet powder. Very sol in water with a bluish-red color, dil solns being strongly fluorescent; very sol in alcohol; slightly sol in HCl, NaOH. LD50 i.v. in rats: 89.5 mg/kg (Webb).
Toxicity data: LD50 i.v. in rats: 89.5 mg/kg (Webb)
Use: As a dye, especially for paper; as a reagent for antimony, bismuth, cobalt, niobium, gold, manganese, mercury, molybdenum, tantalum, thallium, tungsten; as biological stain. Provisionally listed for use in drugs and cosmetics.

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