89331-94-2Relevant articles and documents
A highly selective and sensitive colorimetric chemosensor for Fe2+ based on fluoran dye
Wang, Sheng,Gwon, Seon-Yeong,Kim, Sung-Hoon
, p. 293 - 296 (2010)
A highly selective chemosensor based on fluoran dye for Fe2+, 2′-anilino-3′-methyl-6′-dibuthylamino-N-((2′-(2″-ethylimino) methyl) naphthalen-2-ol) iso-indolin-1-one-fluoran (5), was designed and synthesized. The chemical structures of all the intermediates and the fluoran dye 5 are characterized by 1H NMR, 13C NMR, Ms and elemental analysis. Upon addition of Fe2+, the fluoran dye 5 shows a new peak around 658 nm in its absorption spectra, and the color of solution changed from colorless to greenish black. Whereas other ions including Mg2+, Pb2+, Ni2+, Hg2+, Cd2+, Fe3+, Cu2+, Zn2+ and Al3+ and so on induced basically no spectral change, which constituted a Fe2+ highly sensitive and selective colorimetric chemosensor by naked eyes .
Kass-controlled Hg2+ transport from Crystal Violet Lactone to Fluoran
Lee, Eun-Mi,Gwon, Seon-Yeong,Ji, Byung-Chul,Kim, Sung-Hoon
, p. 1058 - 1061 (2012)
We have investigated the Hg2+ transport from Crystal Violet Lactone to Fluoran dye based on the association constant, Kass. Upon addition of Hg2+, the Crystal Violet Lactone shows a new peak at around 603 nm, and the color of the solution changed from colorless to blue. With the addition of Fluoran dye in this solution containing Crystal Violet Lactone and Hg2+, the absorption intensity of Fluoran dye at 447 nm and 586 nm was all increased. So the color of solution gradually became black from blue color. From the changes of the ratio A586/A447, it is apparent that the Hg2+ in Crystal Violet Lactone-Hg 2+ was transported to colored Fluoran. The Hg2+ transport from Crystal Violet Lactone to Fluoran dye was also carried out by the calculation of the association constant: the binding ability for the complex formation of Fluoran dye and Crystal Violet Lactone-Hg2+ is much greater in CH3CN solution (Kass = 3.0 × 10 4 M-1) than that of the Crystal Violet Lactone with Hg2+ (Kass = 1.2 × 103 M-1).
Method for preparing black fluorane thermal-pressure sensitive dye by virtue of one-step method
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Paragraph 0059-0078, (2017/04/29)
The invention discloses a method for preparing a black fluorane thermal-pressure sensitive dye by virtue of a one-step method. The method comprises the following steps: (1) acid-catalysis cyclic condensation: adding a diphenyl ketone derivative and 2-methyl-4-methoxydiphenylamine into an organic solvent I with a relatively low boiling point, adding a sulfuric acid solution while stirring, and heating to a reflux temperature to react for 1.5-4.5 hours; and (2) post-processing refining: adding water into reaction liquid obtained in the step (1), recycling the organic solvent I with the relatively low boiling point by virtue of heat release, then adding a nonpolar solvent II into the recycled reaction liquid, carrying out heating reflux to separate a water phase so as to obtain an organic phase, carrying out cooling, crystallization, filtering and solvent washing on the organic phase, and drying, so as to obtain the black fluorane thermal-pressure sensitive dye.