A triazole based triferrocene derivative as a multiresponsive chemosensor for Hg(II) ion and a redox chemosensor for H2PO4- ion

作者：Thakur Arunabha; Mandal Dipendu; Ghosh Sundargopal^*

来源：Journal of Organometallic Chemistry, 2013, 726: 71-78.

DOI：10.1016/j.jorganchem.2012.11.031

• Triferrocene
• Chemosensor
• Hg2+ ion
• H2PO4- ion
• Aqueous environment

A triazole tethered triferrocene receptor, C40H40O2N6Fe3 3, has been synthesized from the reaction of mono-alkynyl substituted ferrocene, 1 and 1,1'-bis-(azidomethyl) ferrocene, 2. Consequently the cation and anion sensing properties of 3 have been examined. The receptor 3 was found to be highly selective electrochemical (Delta E-1/2(1) = 145 mV, Delta E-1/2(2) = 92 mV), optical and chromogenic chemosensor for Hg2+ ion in aqueous environment. The substantial changes in its absorption spectra are accompanied by the appearance of a new low-energy peak at 631 nm (epsilon = 3400 M-1 cm(-1)). This is also accompanied by a strong color change from yellow to purple, that allows a prospective for the "naked eye" detection of Hg2+ ion over other competitor cations such as Pb2+, Cd2+, Zn2+, etc. In addition, among various anions, 3 shows a distinct electrochemical recognition of dihydrogen phosphate anion by its multiple H-bonding (C-H center dot center dot center dot O), which is supported by electrochemical (large cathodic shift Delta E-1/2 = -175 mV) and H-1 NMR titration results.

• 出版日期2013-2-15