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- W2028925072 abstract "Electroactive coordination polymers have been prepared by reacting Fe2+ and Co2+ with bis(bipyridyl)alkane (bba) ligand films that have been spin coated onto glassy carbon electrodes. The resulting films exhibit redox characteristics similar to those of electropolymerized vinyl(bipyridyl) metal complexes. The stability of the electrode-bound films increases as the length of the linking alkyl chain decreases. Better stability is also obtained with Fe2+ films than Co2+ films and with the alkyl-linking group attached at the 4-position rather than the 5-position. Charge-transport measurements using chronoamperometry have been conducted on poly-FeII/bba films in which the alkyl linker consists of 2, 4, and 6 methylene groups. Values of D1/2C (D = charge-transfer diffusion coefficient; C = concentration of redox sites) range from 9.5 × 10-8 to 2.3 × 10-8 mol/cm2 s1/2 at 298 K and follow a trend of decreasing D1/2C with increasing alkyl chain length for the 4-position−linked FeII/bba polymers. No such trend is observed for the analogous 5-position−linked systems. Activation parameters Ea and ΔH⧧ range from 22 to 31 kJ/mol, whereas ΔS⧧ ranges from −30 to −75 J/mol K. The results are consistent with a mechanism in which the increase in methylene chain length causes a decrease in the rate of charge transport due to the lower frequency of electron-transfer collisions between neighboring redox sites. However, polymer segmental motion is also believed to play a secondary role in this mechanism." @default.
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- W2028925072 date "1998-12-23" @default.
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- W2028925072 title "Coordination Polymers Based on Bis(bipyridyl)alkane Ligands: Film Preparation and Charge-Transport Characteristics" @default.
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- W2028925072 doi "https://doi.org/10.1021/la9810509" @default.
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