Novel redox receptors for ion-pair and α-amino acid: synthesis and complexation properties of calix[4]arene derivatives bearing large conjugated ferrocene groups
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Abstract
By reacting calix[4]arene 1,3-bi-hydrazide derivative (2) with formacylferrocene in “1 + 2” condensation mode, novel calix[4]arene derivative bearing two conjugated ferrocene groups (3) was obtained in yield of 88%. By reacting 1,3-bi-substituted [2-(p-formylphenyloxy)ethyloxy]-p-tert-butylcalix[4]arene (5) with 1,1′-diacetylferrocene hydrazone (4) in “1 + 1” condensation mode, novel calix[4]arene derivative with 1,3-substituted large conjugated ferrocene bridge (6) was synthesized in yield of 83%. The structures and conformations of new compounds were confirmed by elemental analyses, IR spectra, ESI-MS, 1H NMR, etc. The electrochemical cyclic voltammetry experiments revealed that compounds 3 and 6 possessed excellent reversible electrochemical properties. The 1H NMR titration study showed that compound 6 possessed excellent complexation abilities for NaH2PO4 and glycine in 1:1 host–guest complex with the association constants of 3,850 and 2,460 M−1, respectively.
Keywords
Calix[4]arene Ferrocene Complexation Redox Ion pair Amino acidNotes
Acknowledgment
Financial supports from the National Natural Science Foundation of China (No. 20402002), Fujian Natural Science Foundation of China (No. 2009J01019) and Program for Excellent young researchers in University of Fujian Province (No. JA10056) were greatly acknowledged. Thanks to Dr. Shangjie for the help of complexation properties.
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