A novel chromogenic and fluorogenic chemosensor RhB-pMOSal comprising a rhodamine fluorophore and a salicylaldehyde receptor being connected by an iminohydrazine link was synthesized and fully characterized. Its sensing behavior toward various metal ions in neutral aqueous solution was investigated by absorption and fluorescence spectroscopy. RhB-pMOSal exhibited a reversible and sensitive “turn-on” response of absorption and fluorescence toward Cu2+ in aqueous acetonitrile solution. Approximate 65 and 6-fold enhancement in the absorbance at 556 nm and fluorescence intensity at 573 nm were estimated when equivalent Cu2+ was added to the RhB-pMOSal solution. Under the same conditions, RhB-pMOSal displayed more sensitive than a reported analogue RhB-Sal to Cu2+ ion. The competition experiments for Cu2+ mixed with common metal ions exhibited no obvious change in absorption and emission except Cr3+ ion that can induce the fluorescence quenching of RhB-pMOSal to some extent.
Rhodamine-based molecular clips for highly selective recognition of Al<sup>3+</sup>ions: synthesis, crystal structure and spectroscopic properties
作者:Anamika Dhara、Atanu Jana、Nikhil Guchhait、Prasanta Ghosh、Susanta K. Kar
DOI:10.1039/c3nj01447a
日期:——
synthesized, and used as a selective Al+3 ion sensor. Upon addition of Al3+ to an aqueous-acetonitrile solution of L, the development of a strong fluorescence signal by a chelation-enhanced fluorescence (CHEF) process was observed with an attractive glowing orange emission. This sensor shows high selectivity towards Al3+ ions in the presence of other competing metal ions. The fluorescence quantum yield of
Fluorescence sensing of iodide and bromide in aqueous solution: anion ligand exchanging and metal ion removing
作者:L. Xu、Y. Xu、W. Zhu、Z. Xu、M. Chen、X. Qian
DOI:10.1039/c2nj40102a
日期:——
A new rhodamine-based fluorescent probe RSP was facilely synthesized. Interestingly, the RSP-Hg-ClO4 ensemble can serve as a selective fluorescent probe for iodide and bromide based on metal ion removal and anion ligand exchanging, which is a novel rhodamine-based fluorescence sensing mechanism. Moreover, RSP can recognise Hg2+ selectively in 99% aqueous solution.
Rhodamine-azobenzene based single molecular probe for multiple ions sensing: Cu2+, Al3+, Cr3+ and its imaging in human lymphocyte cells
作者:Subhabrata Mabhai、Malay Dolai、Surya Kanta Dey、Anamika Dhara、Sujata Maiti Choudhury、Bhriguram Das、Satyajit Dey、Atanu Jana
DOI:10.1016/j.saa.2019.04.056
日期:2019.8
A photoinduced electron transfer (PET) and chelation-enhanced fluorescence (CHEF) regulated rhodamine-azobenzene chemosensor (L) was synthesized for chemoselective detection of Al3+, Cr3+, and Cu2+ by UV–Visible absorption study whereas Al3+ and Cr3+ by fluorimetric study in EtOH-H2O solvent. L showed a clear fluorescence emission enhancement of 21 and 16 fold upon addition of Al3+ and Cr3+ due to
On the basis of rhodamine, a versatile trifunctional chemosensor RP has been synthesized. It can selectively and sensitively recognize Cu2+ and Zn2+ in different solutions. Based on the zinc-containing [RP@Zn2+] complex, it shows highly selective recognition for His/Cys. Fluorescent imaging of Zn2+ in living cells was also obtained.