Sulfonic fluorescein

Structural formula
General
Surname	Sulfonic fluorescein
other names	o - (3,6,9-Trihydroxyxanthen-9-yl) -benzenesulfonic acid-γ-sultone Spiro (3 H -2,1-benzoxathiol-3,9 '- (9 H ) xanthene) -3', 6'-diol-1,1-dioxide 3,6-dihydroxy-9- (2-sulfophenyl) xanthylium betaine 3 ', 6'-Dihydroxyspiro [3 H -2,1-benzooxathiol-3,9' - [9 H ] xanthene] 1,1-dioxide 3 ', 6'-Dihydroxyspiro [3 H -2,1-benzoxathiol-3,9'-xanthene] -1,1-dioxide Sulphonfluorescein
Molecular formula	C 19 H 12 O 6 S
Brief description	crystalline brown powder
External identifiers / databases
CAS number 4424-03-7 EC number 224-596-9 ECHA InfoCard 100.022.362 PubChem 78140 Wikidata Q27261175
properties
Molar mass	368.36 g mol −1
Physical state	firmly
density	1.72 g cm −3
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sulfonfluorescein is a dye from the class of the sulfonphthaleins and the xanthene dyes .

presentation

Sulfonfluorescein is synthesized from 2-sulfobenzoic anhydride and resorcinol .

use

Sulfonfluorescein is used in the pH range between 5 to 8 as an indicator for determining the halide concentration . At a chloride concentration of 0.01 N, a pink precipitate forms from the yellow suspension.

Individual evidence

1. ↑ ^{a b c d} Safety data sheet 3,6-Dihydroxy-9- (2-sulfophenyl) xanthylium betaine from Alfa Chemicals, accessed on August 12, 2019.
2. ↑ R. Hönigschmid-Grossich: The properties of sulfonfluorescein and its halogenated derivatives as adsorption indicators. In: Fresenius' magazine for analytical chemistry . 195, 1963, pp. 438-438, doi : 10.1007 / BF00490004 .