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Title: One-electron redox kinetics of aqueous transition metal couples Zn2+/+, Co2+/+, and Ni2+/+ using pulse radiolysis

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/d0cp03214j· OSTI ID:1799642

The one-electron redox potentials for aqueous metal couples Co2+/+ and Ni2+/+ have been investigated by using pulse radiolysis using their reactions with a series of reference compounds to establish the most positive upper limits of E0. Experiments with Zn+ were also carried out to confirm the characteristic shape of the expected reduction kinetics. Both formate ions and t-BuOH were employed to scavenge ˙OH radicals and ˙H atoms. Kinetics and fitted first and second order reaction rates have been reported for reactions with methyl viologen, fluorescein, Ru(NH3)63+, Co(en)32+, Co(sepulcrate)3+, Ru(bpy)32+, Cr(bpy)33+, and Ni(Me6[14]4,11-dieneN4)2+. Previous work demonstrated that both Co2+ and Ni2+ can be reduced by CO2˙- radicals, giving a negative E0 limit of -1.9 V vs. SHE. A definite reaction of Ni+ with fluorescein di-anions provides a new upper limit of the Ni2+/+ couple as -0.906 V vs. SHE. The reaction of Co+ with Ru(bpy)32+ has been confirmed, giving E0 = -1.3 V vs. SHE as a rigorous upper limit of the Co2+/+ couple. In the case of Co2+/+, kinetics were complicated by a self-catalyzed metal clustering phenomenon. Initiation rate constants of this process have also been reported.

Research Organization:
University of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FC02-04ER15533
OSTI ID:
1799642
Alternate ID(s):
OSTI ID: 1648166
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 22, Issue 34; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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