A New Hg2+-Selective Fluorescent Sensor Based on a 1,3-Alternate Thiacalix[4]arene Anchored with Four 8-Quinolinoloxy Groups

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• 作者：L. Praveen ; V. B. Ganga ; R. Thirumalai ; T. Sreeja ; M. L. P. Reddy ; R. Luxmi Varma
• 刊名：Inorganic Chemistry
• 出版年：2007
• 出版时间：August 6, 2007
• 年：2007
• 卷：46
• 期：16
• 页码：6277 - 6282
• 全文大小：267K
• 年卷期：v.46,no.16(August 6, 2007)
• ISSN：1520-510X

文摘

A new thiacalix [4]arene derivative in a 1,3-alternate conformation bearing four quinolinoloxy groups through propylchains has been synthesized, and its metal ion-binding and fluorescence-sensing properties were investigated inboth THF and 10% H₂O-THF systems. The designed ligand exhibited pronounced Hg²⁺-selective on-off typefluoroionophoric properties among the representative transition and heavy metal ions including Cu²⁺. The detectionlimit for Hg²⁺ was found to be 2.0 × 10^-6 M in the mixed H₂O-THF system. Detailed spectral studies including ¹HNMR 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 enclosingone Hg²⁺ ion each in the four cavities thus formed.