Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 78, Issue 5, Pages 2104-2110Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo302309m
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Funding
- National Natural Science Foundation of China [21272021]
- Beijing Natural Science Foundation [7112008]
- National Key Technology RD Program [2011BAD23B01]
- National Basic Research Program of China [2009CB930200]
- Beijing City Education Committee [KM201010005009]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0843934] Funding Source: National Science Foundation
- Office Of The Director
- Office Of Internatl Science &Engineering [968399] Funding Source: National Science Foundation
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A series of triarylimidazoles was synthesized and characterized electrochemically. The synthetic route is general, providing a pathway to 30 redox mediators that exhibit a > 700 mV range of accessible potentials. Most of the triarylimidazoles display three oxidation peaks where the first redox couple is quasi-reversible. The electronic character of the substituents affects the oxidation potential. This is exemplified by a linear correlation between the first oxidation potential and the sum of the Hammett sigma(+) substituent constants, as well as with a series of calculated ionization potentials. We close by putting forward a rule of thumb stating that for a given mediator, the upper limit of accessible potentials can be extended by at least 500 mV beyond the largest recorded value. A rationale, the conditions under which the rule is likely to apply, and an example are provided.
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