Copillar[5]arene-rhodamine conjugate as a selective sensor for Hg 2+ ions

A new copillar[5]arene coupled rhodamine probe 1 has been designed and synthesized. The molecular probe shows selective sensing of Hg 2+ ions over a series of metal ions in CH 3 CN by exhibiting a color change of the solution as well as ‘turn-on’ fluorescence. Compound 1 also shows interaction with...

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Bibliographic Details
Published in:New journal of chemistry 2020-04, Vol.44 (15), p.5921-5928
Main Authors: Roy, Saswati Ghosh, Mondal, Subhendu, Ghosh, Kumaresh
Format: Article
Language:English
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Summary:A new copillar[5]arene coupled rhodamine probe 1 has been designed and synthesized. The molecular probe shows selective sensing of Hg 2+ ions over a series of metal ions in CH 3 CN by exhibiting a color change of the solution as well as ‘turn-on’ fluorescence. Compound 1 also shows interaction with Cu 2+ by exhibiting a different color and spectral changes. Furthermore, Hg 2+ has been differentiated from Cu 2+ by using tetrabutylammonium iodide (TBAI). While in the presence of TBAI, the reddish violet color of the 1 –Cu 2+ complex becomes colorless with the regeneration of the original electronic spectrum of 1 ; under identical conditions, the pink color of the 1 -Hg 2+ complex is not changed in the presence of TBAI. Model compound 2 with no pillar[5]arene moiety has been synthesized to validate the role of pillararene in the selectivity of metal ion sensing. Importantly, compound 2 does not show any selectivity in sensing under identical conditions. Complexation studies are performed by using UV-vis, fluorescence, FTIR and NMR spectroscopic methods.
ISSN:1144-0546
1369-9261
DOI:10.1039/C9NJ06264E