Hongxia Luo

Electrochemical properties of metallofullerenes and their anions

Abstract Pure endohedral metallofullerenes Sm@C82 and Gd@C82 have been separated by HPLC and their cage symmetry is speculated to be C2v by comparing their UV–Vis–NIR spectra. Analysis of the experimental results indicated that this symmetry was favored under our condition for both of them. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) of Sm@C82 were first measured and more information of the electrochemical property of Gd@C82 was obtained, which revealed that the entrapped Gd and Sm atoms took different oxidation state in the fullerene cage with the same symmetry and these two metallofullerenes had good electron accepting ability. Their anions were successfully produced in a simple manner and characterized with UV–Vis–NIR spectra. This achievement would provide an important route to prepare new functionalized materials.

Electrochemical properties of Gd@C82 and its anions

Abstract Cyclic voltammogram (CV) and differential pulse voltammogram (DPV) of Gd@C 82 were measured by using mixed solvent system and low temperature. The sixth and seventh electron transfers for Gd@C 82 were observed under this condition. Analysis of its electrochemical data and the changes of its UV–VIS–NIR spectrum indicated that Gd@C 82 ( n −) ( n =1,3) anions had been generated by chemical method.

Photoelectric conversion property of monolayer films of fullerene tetracarboxylic acid derivatives

Abstract An amphiphilic C 60 tetracarboxylic acid ( 1 ) and its tetramethyl ester ( 2 ) have been prepared. They form stable Langmuir monolayer at the air-water interface, which can be deposited on semiconducting transparent ITO electrodes. The photoelectric responses of the monolayer-modified electrodes are measured in a conventional photoelectrochemical cell. The anodic photocurrent observed corresponds to an electron transfer from the electrolyte through LB film to the electrode. The action spectrum of the photocurrent is in good agreement with the absorption spectrum of the modified ITO electrode, confirming that the excited C 60 derivatives act as the photoactive species in the photoinduced electron transfer process. Factors influencing the photocurrent have been studied such as the intensity of the irradiation, concentration of redox agent in the electrolyte solution, bias voltage and pH.

Microelectrode Voltammetry for the Study of Pyrrolidinofullerenes

The electrochemical behaviors of five pyrrolidinofullerenes containing ester groups have been investigated by cyclic voltammetry on a gold microdisk electrode. Four reversible waves for each fullerene derivatives are observed. The potential values for these four waves differ slightly from one compound to the other. The diffusion coefficient of these compounds is measured according to their steady-state voltammograms.

Study of electrochemical properties of pyrrolidinofullerenes by microelectrode voltammetry

Abstract The electrochemical behavior of nine pyrrolidinofullerenes has been investigated by cyclic voltammetry on a gold microdisk electrode. Four reversible reduction peaks and two irreversible reduction peaks are observed for each fullerene derivative. The half-wave potentials of all pyrrolidinofullerenes are more negative than those of C60 itself. The diffusion coefficient of these compounds is measured by their steady-state voltammograms.

Multifullerene compounds involving 2,5-dimethoxycarbonylpyrrolidinofullerene, from dumbbells to star shaped tris-, tetrakis- and hexakisfullerenes

Abstract The monoamidated derivative of 2,5-dimethoxycarbonylpyrrolidinofullerene with sebacoyl chloride can be attached to various multifunctional amines and alcohols to form multifullerene compounds.

Electrocatalysis of nicotinamide adenine dinucleotide at a (C70) 2-p-tert-butylcalix[8]arene chemically modified electrode

Abstract The electrocatalytic activity of a (C 70 ) 2 -L chemically modified electrode toward nicotinamide adenine dinucleotide in a 1:1 mixed solvent of acetonitrile and water containing tetra- n -butylammonium perchlorate as the supporting electrolyte is described.

Cyclic Voltammetry Study of the C60‐EDTA Derivative Films

The films of an amphiphilic C60-EDTA (C60EA) and its tetramethyl ester (C60EM), prepared both by drop-coating and Langmuir-Blodgett (LB) technique, were studied by cyclic voltammetry in acetonitrile solutions of tetra-n-butylammonium hexafluorophosphate as the supporting electrolyte. The drop-coated film of C60EM displayed four pairs of redox peaks, which vanished after a few cycles due to the film dissolution. For the LB film of C60EM, three irreversible reduction peaks were observed. Both the drop-coated and the LB film of C60EA showed two irreversible reduction peaks.

Electrochemical characterization of mono- and bisfullerene compounds involving 2,5-dimethoxycarbonylpyrrolidinofullerene using microelectrode voltammetry

Abstract The electroreduction behavior of nine 2,5-dimethoxycarbonylpyrrolidinofullerenes and three 2,5-dimethoxycarbonylpyrrolidinofullerene dimers has been investigated by cyclic voltammetry (CV) on a gold microdisk electrode. Four reversible reduction peaks and two irreversible reduction peaks are observed for each fullerene derivatives. The half-wave potentials of all the derivatives are more negative than that of C 60 itself. The diffusion coefficient of each monofullerene derivatives is measured according to their steady-state voltammograms.