| 释义 |
isatin Chem.|ˈaɪsətɪn|
Also -ine.
[f. L. isat-is, a. Gr. ἰσάτις the plant woad, whence a blue dye is obtained + -in1.]
A crystalline, reddish-orange substance (C8H5NO2), of brilliant lustre, obtained from indigo by oxidation.
Isatin in combination plays the part of an acid, forming ˈisatites, e.g. potassium isatite, C8H4KNO2. With bromine and chlorine it forms broˈmisatin (C8H4BrNO2), chloˈrisatin, in which one or two atoms of hydrogen are replaced by equivalent quantities of bromine or chlorine. The salts of these are bromisatites, chlorisatites.
1845Penny Cycl. 1st Suppl. 346/1 Isatin, a substance obtained from indigo by the addition of two equivalents of oxygen..It crystallizes in prisms, which are of a yellowish red or deep aurora-red colour. 1850Daubeny Atom. The. viii. (ed. 2) 237 When indigo is oxidized by means of nitric acid, it becomes converted into a bright red crystalline body termed isatine. 1875H. C. Wood Therap. (1879) 67 A green color begins at once to develop, and in a little while passes into the clear yellow of isatin. |