A new Hg(2+) -selective fluorescent sensor based on a 1,3-alternate thiacalix[4]arene anchored with four 8-quinolinoloxy groups |
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Authors: | Praveen L Ganga V B Thirumalai R Sreeja T Reddy M L P Varma R Luxmi |
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Institution: | Chemical Sciences and Technology Division, National Institute for Interdisciplinary Science and Technology, NIST (Formerly Regional Research Laboratory), CSIR, Thiruvananthapuram, India. |
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Abstract: | A new thiacalix 4]arene derivative in a 1,3-alternate conformation bearing four quinolinoloxy groups through propyl chains has been synthesized, and its metal ion-binding and fluorescence-sensing properties were investigated in both THF and 10% H2O-THF systems. The designed ligand exhibited pronounced Hg2+ -selective on-off type fluoroionophoric properties among the representative transition and heavy metal ions including Cu2+. The detection limit for Hg2+ was found to be 2.0 x 10(-6) M in the mixed H2O-THF system. Detailed spectral studies including 1H NMR and MALDI-TOF mass spectroscopy reveal the unusual formation of a tetramercury complex with the ligand, in which the four propyl arms containing the quinolinoloxy groups adopt a "tetrapodand" conformation enclosing one Hg2+ ion each in the four cavities thus formed. |
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