A Novel Cr3+ Fluorescence Turn-On Probe Based on Rhodamine and Isatin Framework

作者：Dhara Anamika; Guchhait Nikhil^*; Kar Susanta K

来源：Journal of Fluorescence, 2015, 25(6): 1921-1929.

DOI：10.1007/s10895-015-1684-0

• Chemosensor
• Cr3+ ion
• Fluorescence
• Job's plot
• Rhodamine derivative

A novel turn-on fluorescent dye (E)-3',6'-bis(diethylamino)-2-((1-(naphthalen-2-ylmethyl)-2-oxoindolin-3-ylidene)amino)spiro[isoindoline-1,9'-xanthen]-3-one (RBNI) based on a rhodamine-isatin hybrid molecular architecture was synthesized by condensation of isatin derivative with rhodamine hydrazide. The dye RBNI is selective and sensitive for recognition of Cr3+ ion in aqueous CH3CN media over other tested metal ions. The sensor shows large fluorescence enhancement upon complexation with Cr3+ and simultaneous color change occurs from colorless to pink-red. Spectroscopic study predicted 1:1 binding stoichiometry between RBNI and Cr3+ ion and this was again verified through ESI-MS (Electrospray Ionisation Mass Spectrometry). Detection limit of Cr3+ ion by this dye was calculated to be 2.4 mu M. Furthermore, the potential application of this dye for the monitoring of Cr3+ ions in pond water and tap water samples was demonstrated.

• 出版日期2015-11