Behavior Of Ferrocene Research Articles

Ferrocene partition calculation in a biodiesel/water interface using electrochemical methods

This work is a continuation of previous studies concerning the behaviour of ferrocene in a mixture of two insoluble liquids. In this paper, the system reached partition equilibrium after approximately 175 min. Electroanalytical studies were executed, and a high reproducibility was observed in a range of concentrations from 2 to 14 × 10−5 mol L−1 of ferrocene that escaped from the oil to the aqueous phase. Because ferrocene most likely occurs only in the monomeric form in both the oil and aqueous phases, it was possible to predict a partition coefficient (log P(oil/water)) of ferrocene of approximately 2.4.

Electrochemical Behavior of Nitrochlorobenzene Isomers Based on Ordered Porous Silica Carbon Paste Electrode

Several ordered porous materials with representative well-regulated size and cavum structure was synthesized, such as HMS, MCM-41, MCM-48, SBA-15. The ordered porous materials modified carbon paste electrodes were fabricated and well-characterized. The voltammetry behavior of ferrocene at modified paste electrode was investigated. The voltammetry behavior of nitrochlorobenzene isomers at the modified carbon paste electrode was studied respectively. The differences in adsorption of nitrochlorobenzene isomers at these electrodes interface were investigated respectively in electrochemical methods, and the corresponding determination methods were established successfully. Under the optimal condition, o-, m-, p-chloronitrobenzene had a clear reduction peak current. The obvious voltammetric peak showed a linear relationship with the concentration of chloronitrobezene range. The constructed electrode showed excellent reproducibility and stability. The CVs at MCM-41/CPE show clear difference between the three isomers. Based on the difference of their electrochemical behavior, the system for the electrochemical detection of nitrochlorobenzene would be established. The high sensitivity, the good selectivity, the satisfactory repeatability make the method full of practical value. The theory meaning of this research to discuss the electrochemical reaction mechanism of chloronitrobenzene isomers was great.

Electrochemically Controlled Adsorption of Fc-Functionalized Polymers on β-CD-Modified Self-Assembled Monolayers

This work presents an in situ study of the adsorption/desorption behavior of ferrocene(Fc)-functionalized linear polymers on a gold surface covered with beta-cyclodextrin(beta-CD)-modified self-assembled monolayers (SAMs). The characterization of binary SAMs obtained with HS-(CH(2))(11)-EG(6)-N(3) and HS-(CH(2))(11)-EG(4)-OH (EG, ethylene glycol) was performed using a quartz crystal microbalance with dissipation monitoring (QCM-D), cyclic voltammetry, and contact angle measurements. The functionalization of SAMs with beta-CD was made via the "click" reaction between the beta-CD monoalkyne derivative and azide groups exhibited by SAMs. The formation of the host-guest complex between SAM-beta-CD and Fc-derivatized polymers (chitosan (CHI) and poly(allylamine hydrochloride) (PAH)) was studied by QCM-D. The viscoelastic model of Voinova was used to fit QCM-D curves recorded during the adsorption and electrochemically controlled desorption of CHI-Fc and PAH-Fc on SAM-beta-CD. Using QCM-D coupled to cyclic voltammetry, we demonstrated that CHI-Fc and PAH-Fc can be successfully deposited on a SAM-beta-CD-coated gold surface forming a stable multivalent inclusion complex between Fc moieties of polymer and beta-CD cavities of SAM. We also showed that all specifically attached polymer chains can be detached from the SAM-beta-CD-coated gold surface by applying an electric field.

界面活性剤ミセル中の可溶化フェロセンの電気化学的挙動 フェリシニウムイオンと陰イオンミセル間の静電相互作用（原標題は英語）

界面活性剤ミセル中の可溶化フェロセンの電気化学的挙動 フェリシニウムイオンと陰イオンミセル間の静電相互作用（原標題は英語）

The Influence of Fluoride Media and CH3CN on the Voltammetric Behavior of Ferrocene, Quinhydrone, and Methyl Phenyl Sulfide on Pt and Carbon Electrodes

Cyclic voltammetric behavior of ferrocene, quinhydrone, and methyl phenyl sulfide on Pt, glassy carbon (GC) and polypropylene composite graphite (CPP) electrodes are compared in TBAP/CH3CN, triethylamine (TEA).3HF/CH3CN and TEA.3HF media. In medium containing CH3CN, the voltammetric behavior of title compounds are quite similar in the absence and presence of fluoride ions. The voltammetric features vary only slightly, due to some adsorption effects and catalytic hydrogen evolution on Pt. In TEA.3HF medium, all three electrodes show significantly higher background currents in the middle potential region itself. The peak potential and the charge transfer rate constant of these compounds are also found to be significantly different in TEA.3HF room temperature melt. The analytical implications of these medium effects are also discussed.

Observation of low-frequency electrical current oscillations in ferrocene sample with adsorbed 2-propanol vapor

Low-frequency oscillations in electrical current (dark) as a function of time were observed, in the temperature range where unusual/anomalous change in electrical conductivity with temperature was noticed in the samples of ferrocene with physically adsorbed 2-propanol vapor (at 40 torr pressure) molecules as impurities in a sandwich type of cell configuration. With the increasing bias voltage across the electrodes, at a constant sample cell temperature, increase in both the time interval between the two consecutive current peaks (i.e. decrease in frequency of current oscillations) and current peak height was noticed. The current-voltage characteristics behavior of ferrocene with adsorbed 2-propanol vapor has indicated the ohmic nature of conductivity. Existing theories of current oscillations in semiconductors have failed to explain the observed low-frequency current oscillations in this organometallic semiconductor. Such current oscillations are possibly associated with some kind of time dependent phase changes in the ferrocene- (2-propanol) vapor system/surface layer.

Electrochemistry of ferrocene in anionic, cationic and nonionic micellar solutions. Effet of the micelle solubilization of the half-wave potentials

The redox properties of the ferrocene/ferricinium Fc/Fc + couple were studied in aqueous 0.1 M NaCl solution of sodium dodecylsulphate (SDS), N-cetyltrimethylammonium bromide (CTAB) and polyoxyethylene-23 lauryl ether (Brij 35). Solubilities of ferrocene were measured by spectrophotometry and by limiting current measurements in direct current voltammetry. The reversible half-wave potentials were determined by cyclic and differential pulse voltammetry. The results are discussed on the basis of the micelle solubilization equilibrium of both the reductant Fc and the oxidant Fc +. Indeed, diffusion coefficient ratios of the oxidant to the reductant, measured by coulometry, show that the micelle solubilization of the electrogenerated ferricinium cation Fc + must also be considered in the nonionic and the anionic micellar solutions. Thus in every solution studied, a standard potential of Fc/Fc + in water may be obtained from the experimental values of the half-wave potentials, the partition coefficients of Fc and Fc + and the ratio of their diffusion coefficients. The behaviour of ferrocene in the SDS solutions and the effect produced by the addition of pentanol seem to confirm that SDS forms micelles with a less ordered structure than the other surfactants studied. The invariance of the half-wave potentials of ferrocene in pure SDS solutions whatever the surfactant and ferrocene concentrations suggests the use of this solute-solvent couple as a reference potential system.

The behaviour of ferrocene and ruthenocene in weakly to strongly protic media. Implications on the mechanism of substitutions involving proton as the electrophile

The interaction of ferrocene and ruthenocene with proton donors has been investigated by NMR spectroscopy in a broad range of protic media, including such weakly protic agents as chloroform, moderately acidic systems such as TFA, and more strongly acidic systems such as conc. H 2SO 4. The results indicate that these metallocenes undergo two kinds of interactions with acidic media, viz., π-hydrogen bonding in which the Cp ring is the electron donor and, in the most strongly protic solvents, metal protonation. The (H 0) 1 2 of ruthenocene and a group of ferrocene derivatives have been determined by a combined extractive-spectrophotometric technique. These values show that the metal atom acts as a very weak base. The H/D exchange rate of ruthenocene in conc. D 2SO 4 decreases on increasing acid concentration, which rules out the metal-protonated species as an intermediate in the reaction.