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An Electrochemical and Optical Anion Chemosensor Based on Tripodal Tris(ferrocenylurea)
Author(s) -
Li Minrui,
Wu Biao,
Jia Chuandong,
Huang Xiaojuan,
Zhao Qilong,
Shao Shijun,
Yang XiaoJuan
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201001696
Subject(s) - tris , ion , electrochemistry , chemistry , photochemistry , combinatorial chemistry , organic chemistry , electrode , biochemistry
A neutral tripodal tris(ferrocenylurea) anion receptor has been designed that can electrochemically and optically recognize sulfate and phosphate anions. The binding of the tetrahedral anion induced distinct cathodic shifts of the ferrocene/ferrocenium redox couple in chloroform, whereas the UV/Vis spectrum of the receptor showed an increase in the d–d transition band upon addition of sulfate ions. Furthermore, the anion complexes (TBA) 2 ⋅ [SO 4 ⊂L] ⋅ H 2 O ( 1 ) and TBA[F⊂L] ( 2 ; TBA=tetrabutylammonium ion) were isolated. Crystal structural analyses showed that the receptor in the two 1:1 (host/guest) complexes encapsulated sulfate or fluoride ions in the tripodal cavity through multiple hydrogen bonds. 1 H NMR spectroscopic and ESI mass‐spectrometric analysis revealed strong sulfate and fluoride binding in solution.