252. Alizarin Cyanine Green F

Nomenclature

CAS number: 4403-90-1
2,2′-[(9,10-Dihydro-9,10-dioxo-1,4-anthracenediyl)diimino]bis(5-methylbenzenesulfonic acid) sodium salt (1:2); 6,6′-(1,4-anthraquinonylenediimino)di-m-toluenesulfonic acid disodium salt; D & C Green No. 5; C.I. Acid Green 25; C.I. 61570.
C28H20N2Na2O8S2; mol wt 622.58.
C 54.02%, H 3.24%, N 4.50%, Na 7.39%, O 20.56%, S 10.30%.

Description and references

Discovered by R. E. Schmidt in 1894: Colour Index vol. 4 (3rd ed., 1971) p 4541.

Chemical structure

Properties

Green powder. Slightly sol in acetone, alc, pyridine. Insol in chloroform, toluene. Dull blue soln in conc H2SO4, turning turquoise on dilution. Absorption spectra: C. F. H. Allen et al., J. Org. Chem. 7, 63, 169 (1942).

Use

For nylon sutures: Fed. Regist. 42, 52395 (1977). Permitted for use in drugs and cosmetics, excluding use in eye area: ibid. 47, 49628 (1982).