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Title: A new Hg2+-Selective fluorescent sensor based on a 1,3-alternate thiacalix[4]arene anchored with four 8-quinolinoloxy groups
Authors: Praveen, L
Ganga, V B
Thirumalai, R
Sreeja, T
Reddy, M L P
Luxmi Varma, R
Keywords: Metal-ions
Appended diaza-18-crown-6
Coordination chemistry
Mercuric ion
Hg2+ ion
Issue Date: 2007
Publisher: American Chemical Society
Citation: Inorganic Chemistry 46(16):6277-6282;6 Aug 2007
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 H-1 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.
ISSN: 0020-1669
Appears in Collections:2007

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