The instructive redox behaviour of 4‐ferrocenylcatechol on nanocrystalline titanium dioxide electrodes

Abstract

An investigation into the redox behaviour of 4-ferrocenylcatechol bound to nanocrystalline TiO 2 electrodes identified a limitation to the use of catechol as an electron-transfer facilitating anchoring group. 4-Ferrocenylcatechol was adsorbed to transparent nanocrystalline TiO 2 electrodes. UV-visible spectra of the modified electrode were recorded in an acetonitrile-electrolyte solution. At an applied potential of +0.45 mV (vs Ag/AgCl/Cl − ) the ferrocenyl group oxidized to the ferrocenium cation and the catecholate group oxidized to the benzoquinone form. Subsequent application of a potential of 0 V reduced the ferrocenium to ferrocene but, owing to the irreversibility of the catechol oxidation in aprotic solvents, benzoquinone is not reduced to catecholate and subsequently desorbs and is lost due into solution. Electrochromic switching of the ferrocenyl electrochromophore on TiO 2 with aprotic electrolyte is, therefore, irreversible.

Application of a 1‐benzyl‐4‐ferrocenyl‐1H‐[1,2,3]‐triazole/carbon nanotube modified glassy carbon electrode for voltammetric determination of hydrazine in water samples

“…In practice, electrode surface modification has been tried as a means of reducing the overvoltage and overcoming the slow kinetics of many electrode processes . A further advantage of chemically modified electrodes is that they are usually less exposed to surface fouling than bare electrodes are . Also, modified electrodes can sometimes separate the electroanalytical signals of solution components whereas, at bare electrode surfaces, the signals appear at potentials close to each other .…”

A Double Electrochemical Platform for Ultrasensitive and Simultaneous Determination of 6-Mercaptopurine and Folic Acid Based on a Carbon Paste Electrode Modified with Zno-Cuo Nanoplates and 2-chlorobenzoyl ferrocene

“…Electroanalytical methods have attracted more attention in recent years for environmental and biological compounds determination due to their sensitivity, accuracy, lower cost, and simplicity. [12][13][14][15][16][17][18][19][20][21] Folic acid or folate is a B vitamin. It is also referred to as vitamin M, vitamin B 9 , vitamin BC (or folacin), pteroyl-L-glutamic acid, and pteroyl-L-glutamate.…”