Title :
Electrochemical properties and synthesis of the conductive polyether tailed cobalt(II) bipyridine complex
Author :
Kim, II-Kwang ; Park, Jong-Sool ; Long, Jeffrey W. ; Murray, Royce W.
Author_Institution :
Wonkwang Univ., Iksan City, South Korea
Abstract :
The synthesis of metal-tris(2,2´-bipyridine) complexes with oligo(ethylene glycol) tails produces ionically-conductive room-temperature melts in which appreciable concentrations of lithium electrolytes dissolve. Charge transport rates in these redox polyether hybrids, in the neat state, have been investigated using microelectrode solid state voltammetry. In the ligand bpy(CO2MPEG350)2 , MPEG350 is -(CH2CH2O)7-CH3. The apparent diffusion coefficient, DAPP, for the oxidation of [Fe(bpy(CO2MPEG350)2)3](ClO4 )2 is ca. 103 larger than that for [Co(bpy(CO2MPEG350)2)3](ClO4 )2. This difference is ascribed to transport dominated in the former by electron self-exchange reactions between adjacent Fe(II) and Fe(III) complexes. The very slow physical self-diffusivity in these metal complex melts, measured by the Co(III/II) reaction, provides an opportunity to assess the effect of electron donor/acceptor concentration on electron self-exchange dynamics in a semisolid matrix. Various models have been described for the site concentration dependency of charge transport in redox polymers, including ion ion association, electron migration, and percolation
Keywords :
association; electrochemistry; ionic conductivity; materials preparation; organic compounds; percolation; polymer melts; voltammetry (chemical analysis); Li electrolyte dissolving; MPEG350; apparent diffusion coefficient; charge transport rates; electrochemical properties; electron donor/acceptor concentration; electron migration; electron self-exchange reactions; ion ion association; ionically-conductive room-temperature melts; metal-tris(2,2´-bipyridine) complexes; microelectrode solid state voltammetry; oligo(ethylene glycol) tails; oxidation; percolation; physical self-diffusivity; polyether tailed cobalt(II) bipyridine complex; redox polyether hybrids; site concentration dependency; synthesis; Chemical elements; Chemistry; Cities and towns; Electron mobility; Equations; Laboratories; Motion measurement; Polymers; Tail; Time measurement;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1997., Proceedings of the 5th International Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-2651-2
DOI :
10.1109/ICPADM.1997.617666
