二硫代荧光素

二硫代荧光素
	IUPAC名; 3′,6′-Bis(sulfanyl)spiro[2-benzofuran-3,9′-xanthene]-1-one
别名	巯基荧光素
识别
CAS号	25319-73-7
PubChem	91396
ChemSpider	82528
SMILES	C1=CC=C2C(=C1)C(=O)OC23C4=C(C=C(C=C4)S)OC5=C3C=CC(=C5)S;
性质
化学式	C20H12O3S2
摩尔质量	364.44 g·mol−1
	若非注明，所有数据均出自标准状态（25 ℃，100 kPa）下。

二硫代荧光素（英语：dithiofluorescein），也可称为巯基荧光素（英语：thiofluorescein）是一种有机化合物，在分析化学中常用作络合指示剂。本身为蓝色，与二价汞离子（Hg²⁺）会生成无色的络合物^[1]，因此可用在2-(羟基汞基)苯甲酸或2-(羟基汞基)苯甲酸钠滴定硫醇中充当终点指示剂^[2]^[3]。二硫代荧光素能通过聚合物固定到光纤上，用于开发硫离子（S^2-）液流检测器^[4]。不像荧光素和荧烷类染料分子中苯环取代基为羟基，二硫代荧光素分子中苯环取代基为巯基，不具备荧光性质^[5]。

参考文献

^ Wroński, Mieczysław. Determination of thiol esters with o-hydroxymercuribenzoic acid. Analyst. 1966, 19 (2): 745–746. doi:10.1039/AN9669100745.
^ Wroński, Mieczysław. Analytical applications of o-hydroxymercuribenzoic acid, dithiofluorescein and mercurated fluorescein. Talanta. 1977, 24 (6): 347–354. PMID 18962100. doi:10.1016/0039-9140(77)80019-2.
^ Chromý, V.; Svoboda, V. The determination of thiomalic acid. Talanta. 1963, 10 (10): 1109–1111. doi:10.1016/0039-9140(63)80152-6.
^ Narayanaswamy, Ramaier; Sevilla, Fortunato III. Flow cell studies with immobilised reagents for the development of an optical fibre sulphide sensor. Analyst. 1986, 111 (9): 1085. doi:10.1039/AN9861101085.
^ Sauer, Markus; Hofkens, Johan; Enderlein, Jörg. 2.2. Organic Fluorophores. Handbook of Fluorescence Spectroscopy and Imaging: From Ensemble to Single Molecules. 2011: 35–38. ISBN 978-3-527-31669-4.

[1] Wroński, Mieczysław. Determination of thiol esters with o-hydroxymercuribenzoic acid. Analyst. 1966, 19 (2): 745–746. doi:10.1039/AN9669100745.

[2] Wroński, Mieczysław. Analytical applications of o-hydroxymercuribenzoic acid, dithiofluorescein and mercurated fluorescein. Talanta. 1977, 24 (6): 347–354. PMID 18962100. doi:10.1016/0039-9140(77)80019-2.

[3] Chromý, V.; Svoboda, V. The determination of thiomalic acid. Talanta. 1963, 10 (10): 1109–1111. doi:10.1016/0039-9140(63)80152-6.

[4] Narayanaswamy, Ramaier; Sevilla, Fortunato III. Flow cell studies with immobilised reagents for the development of an optical fibre sulphide sensor. Analyst. 1986, 111 (9): 1085. doi:10.1039/AN9861101085.

[5] Sauer, Markus; Hofkens, Johan; Enderlein, Jörg. 2.2. Organic Fluorophores. Handbook of Fluorescence Spectroscopy and Imaging: From Ensemble to Single Molecules. 2011: 35–38. ISBN 978-3-527-31669-4.

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