1. Syntheses, Structures, and Electrochemical Properties of Inclusion Compounds of Cucurbit[8]uriI with Cobalt(lIl) and Nickel(Il) Complexes.
- Author
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Mitkina, Tatiana V., Zakharchuk, Nina F., Naumov, Dmitry Y., Gerasko, Olga A., Fenske, Dieter, and Fedin, Vladimir P.
- Subjects
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TRANSITION metals , *COBALT , *NICKEL , *COMPLEX compounds , *CHEMICAL reactions , *OXIDATION-reduction reaction - Abstract
Inclusion compounds of a macrocyclic cavitand cucurbit[8]uril (CB[8]) with cobalt(III) and nickel(II) complexes of 1,3-diaminopropane (tn) and 1,3-diamino-2-propanol (tmOH) {trans-[Co(tn)2Cl2] @ CB[8]}Cl · 14H2O (1), {trans-[Co(tmOH)-(tmO))@CB[8]}Cl2 · 22H2O (2), and {trans-[Ni(tmOH)2]@CB[8]}Cl2 · 22H2O (3) were synthesized and charactenzed by X-ray single crystal analysis, IR spectroscopy, ESI-MS, and by solid-state stripping voltammetry. The encapsulation of trans-[Co(tn)2Cl2]+ within the cavity of CB[8] stabilizes the complex toward ligand substitution reactions in aqueous solution. The electrochemical study demonstrates that CB[8] prefers the oxidized species in trans-[Co(tn)2Cl2]+/trans-[Co(tn)2Cl2]0 and trans-[Co(tmO)(tmOH)2]2+/trans-{Co(tmO)(tmOH)2]+ redox couples, but stabilizes the reduced form trans-[Ni(tmOH)2]2+ against the oxidized species. The reversibility of voltammogram shapes evidence that for the inclusion compounds 1-3 electron transfer reactions proceed within the cavity of the host. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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