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The crystal and molecular structures of sulfonefluorescein have been determined in order to elucidate the structure of the molecular species H2+SF-(zwitter ionic form of sulfonefluorescein, H2SF; Fig. 1 ), which was assumed to exist in an aqueous solution of H2SF in a low-pH region.' Sulfonefluorescein was synthesized according to a method described by Orndorff et al.2, and was purified by dissolving the product in dimethylsulfoxide. After filtration, the compound was crystallized from andoi:10.2116/analsci.10.521 fatcat:6uly2m5ao5gofislg73rihisbi