The ferrocene assumption in redox thermodynamics: implications

Rebecca L. Stiles, Ramjee Balasubramanian, Stephen W. Feldberg, and Royce W. Murray. Journal of .... Michael D. Ryan and James Q. Chambers. Analytical...
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5010

Inorg. Chem. 1990, 29, 5010-5012

Table 11.

Redox Potentials of Osmium Complexes" complex

Os"'/Os"

Os( Mc-phtcrpj),2t Os( Mc-phtcrpy ) ( PTZ- p h tcrpy)*+

+0.90

Os( Mc-phtcrpy)( Diaa-phtcrpy)*+ Oh( Mc-phtcrpy)(PQ*+-phter~y)~+

+0.94 +0.90

+0.90

D+/Dob

redox potentials, V PQ2+/PQ" PQ*+/PQo

+0.75 +0.76 -0.35

-0.75

Os"/Os' -1.20 - I .20 - I .20 - I .20

OS'/OSOE -1.45 -1.45 -1.48 -1.45

"Cyclic voltammctry measurements on glassy-carbon electrode in CH,CN, vs SCE; Bu4NCIO4(0.1 M) as supporting electroiyte; scan rate = 100 s-'. bD+/Do are the oxidized and reduced parts of PTZ-phterpy (line 2) and Diaa-phterpy (line 3). 'The osmium oxidation states I and 0 are only formal mV

Electronic spectra of [Os(Me-phterpy)(O),(OH)'] [NO