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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Cobalt, Iron and Ruthenium Complexes of Picolinic and Dipicolinic Acids: Syntheses, Solution Properties and Kinetics of Electron Transfer Reactions With Cytochrome C(II) and Some Inorganic Reductants

RM Ellis, JD Quilligan, NH Williams and JK Yandell

Australian Journal of Chemistry 42(1) 1 - 7
Published: 1989

Abstract

Tris picolinate complexes of CO111 and RU111 have been synthesized, and their standard potentials measured (432 ±10, 403 ±2 mV) at 25ºC and ionic strength 0.1 mol dm-3. The self-exchange rate constant of Ru ( pic )3O/- was found to be (1 .4 ±0.9)×108 dm3 mol-1 s-l, from reaction with cytochrome C(II), Co( bpy )32+ and ~Co( phen )32+. For the reaction between Fe( dipic )2- and cytochrome ~(II), at 2S260C, pH 5.5 and I 0.1 mol dm-3 (KNO3), the second-order rate constant was (3.2 ±0.l)×105 dm3 mol-1 s-1,with ΔH+ 19.9 ±0.9 kJ mol-1 and ΔS+ -72.8 ±.7 J K-1 mol-l. The self-exchange rate constant of Fe( dipic )2-/2- was reevaluated as (5.8 ±0.2)×106 dm3 mol-l s-1.

https://doi.org/10.1071/CH9890001

© CSIRO 1989

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