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Author Koh, W. ♦ Dubois, D. ♦ Kutner, W. ♦ Jones, M. T. ♦ Kadish, K. M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ FULLERENES ♦ SYNTHESIS ♦ ACETONITRILE ♦ ALKALI METAL COMPOUNDS ♦ ALKALINE EARTH METAL COMPOUNDS ♦ CRYSTAL DOPING ♦ ELECTROCHEMISTRY ♦ MICROBALANCES ♦ QUATERNARY COMPOUNDS ♦ SALTS ♦ SOLUTIONS ♦ THIN FILMS ♦ AMINES ♦ AMMONIUM COMPOUNDS ♦ BALANCES ♦ CARBON ♦ CHEMISTRY ♦ DISPERSIONS ♦ ELEMENTS ♦ FILMS ♦ MEASURING INSTRUMENTS ♦ MIXTURES ♦ NITRILES ♦ NONMETALS ♦ ORGANIC COMPOUNDS ♦ ORGANIC NITROGEN COMPOUNDS ♦ WEIGHT INDICATORS 400201* -- Chemical & Physicochemical Properties ♦ Electrochemistry
Abstract The electrosynthesis, electrodoping/undoping, and electrodissolution of thin films of C[sub 60] and its salts were studied in acetonitrile solutions at a Au/quartz electrode by simultaneous electrochemistry and microgravimetry with an electrochemical quartz crystal microbalance. The C[sub 60][sup 0] films were deposited either by electrooxidation of C[sub 60][sup 2[minus]] in solutions containing CsAsF[sub 6], KPF[sub 6], or Ca(PF[sub 6])[sub 2], or by electrooxidation of C[sub 60][sup 3[minus]] in solutions containing tetra-n-butylammonium perchlorate, (TBA)ClO[sub 4]. The initial C[sub 60][sup 2[minus]] or C[sub 60][sup 3[minus]] anions were prepared by controlled-potential bulk electroreduction of a C[sub 60][sup 0] suspension. The C[sub 60][sup 0] films electrodeposited from a C[sub 60][sup 2[minus]] solution containing Cs[sup +], K[sup +], or Ca[sup 2+] cations could not be electrodoped with these cations but a conductive (Cs[sup +])[sub 3](C[sub 60][sup 3[minus]]) film could be quantitatively electrosynthesized by electroreduction of C[sub 60][sup 2[minus]] in a solution containing Cs[sup +]. Attempts to electrodeposit (K[sup +])[sub 3](C[sub 60][sup 3[minus]]) or (Ca[sup 2+])[sub 3](C[sub 60][sup 3[minus]])[sub 2] films were successful but a (Ca[sup 2+])(C[sub 60][sup [minus]])[sub 2] film could be prepared. The composition of a given C[sub 60][sup 0] film electrodeposited by constant potential electrooxidation of C[sub 60][sup 3[minus]] in an acetonitrile solution containing (TBA)ClO[sub 4] was controlled by the initial C[sub 60][sup 3[minus]] concentration and/or the electrodeposition potential. These C[sub 60][sup 0] films could be electrodoped with TBA[sup +] cations from solution upon electroreduction at appropriate potentials and both (TBA[sup +])(C[sub 60][sup [minus]]) and (TBA[sup +])[sub 2](C[sub 60][sup 2[minus]]) films were obtained. 66 refs., 10 figs.
ISSN 00223654
Educational Use Research
Learning Resource Type Article
Publisher Date 1993-07-01
Publisher Place United States
Journal Journal of Physical Chemistry
Volume Number 97
Issue Number 26


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