667886-34-2Relevant academic research and scientific papers
Anion binding by calix[4]arene ferrocene ureas
Evans, Andrew J.,Matthews, Susan E.,Cowley, Andrew R.,Beer, Paul D.
, p. 4644 - 4650 (2003)
A ferrocene reporting unit has been successfully incorporated onto the upper-rim of calix[4]arenes through either urea or amide hydrogen bonding units for the preparation of three novel receptors which can sense the binding of anions electrochemically. 1H NMR studies indicate that the receptors have a general preference for binding more basic anions, and in the case of the tetra-urea derivative, a marked selectivity for dihydrogen phosphate. A single crystal X-ray structure of the di-urea derivative reveals the role of hydrogen bonding interactions in the binding of benzoate. Cyclic and square wave voltammetric studies demonstrate that all receptors can electrochemically sense the binding of anions with dihydrogen phosphate inducing the largest shifts.
Amplification of anion sensing by disulfide functionalized ferrocene and ferrocene-calixarene receptors adsorbed onto gold surfaces
Cormode, David P.,Evans, Andrew J.,Davis, Jason J.,Beer, Paul D.
, p. 6532 - 6541 (2010/09/06)
A disulfide functionalized bis-ferrocene urea acyclic receptor and disulfide functionalized mono- and bis-ferrocene amide and urea appended upper rim calix[4]arene receptors were prepared for the fabrication of SAM redox-active anion sensors. 1H NMR and diffusive voltammetric anion recognition investigations revealed each receptor to be capable of complexing and electrochemically sensing anions via cathodic perturbations of the respective receptor's ferrocene/ferrocenium redox couple. SAMs of a ferrocene urea receptor 3 and ferrocene urea calixarene receptor 17 exhibited significant enhanced magnitudes of cathodic response upon anion addition as compared to observed diffusive perturbations. SAMs of 17 were demonstrated to sense the perrhenate anion in aqueous solutions. The Royal Society of Chemistry.
