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Electrochemical and spectral properties of some tantalocene derivatives with one pentamethylated cyclopentadienyl ligand: Cp*(Cp-R)TaCl2 , R = H, SiMe3 or (CH2)(3)NC4H4статья
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Vorotyntsev Mikhail A., Skompska Magdalena, Graczyk Magdalena, Heinze Juergen, Goux Jerome, Pierre Le Gendre, Moise Claude
- Журнал: Journal of Solid State Electrochemistry
- Том: 12
- Номер: 4
- Год издания: 2008
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 421
- Последняя страница: 435
- DOI: 10.1007/s10008-007-0402-5
- Аннотация: Three tantalocene dichloride complexes, Cp*(Cp-R)Ta(IV)Cl-2, with one pentamethylated cyclopentadienyl ligand, Cp* = eta(5)-C5Me5, Me = CH3, and one monosubstituted cyclopentadienyl ligand, Cp-R, Cp = eta(5)-C5H5, R = H, SiMe3 or (CH2)(3)NC4H4, have been studied in acetonitrile solutions with cyclic voltammetry in the ranges of the Ta(IV) oxidation to Ta(V) or of its reduction to Ta(III). The former transition is reversible, while the latter one gives an irreversible wave due to the dissociation of the reduced complex with the loss of one chloride ligand. The redox transformation from the initial state of complex Cp*CpSiMe3TaCl2 to its oxidized state, Cp*CpSiMe3TaCl2+, and back was monitored by spectroelectrochemical measurements in a thin-layer acetonitrile solution. Kinetic data for the evolution of the UV-visible spectrum of the system in the course of the double potential step experiment were treated on the basis of two theoretical models as the reactant diffusion across the solution layer without or with taking into account ohmic losses. The values of the diffusion coefficients of the complex in its initial and oxidized (cationic) states have been estimated. It was demonstrated that this complex in each of two oxidation states, Ta(IV) or Ta(V), is represented by a single molecular form. An attempt to deposit a conducting polymer film by oxidation of the tantalocene complex containing a pyrrole group attached to the Cp ring, Cp*Cp(CH2)(3)PyTaCl2, led to a thin insulating layer at the electrode surface because of an inhibiting effect of chloride anions.
- Добавил в систему: Воротынцев Михаил Алексеевич