2.5 Redox Mediators
35
Table 2.1 (continued)
Compound *1
E° /V versus
SHE
pH
Conditions *2 References
ferrocene ethanol
0.419
7
0.05 M
phosphate, I
= 0.1
[88]
[Os(im) 2 (4,4 -Me 2 -bpy) 2 ] 3+/2+
0.351
7.0
0.1 M
phosphate
[84]
[Co(edta)] 1−/2−
0.376
* [83]
[Co(pdta)] 1−/2−
0.36
* [83]
[Co(cydta)] 1−/2−
0.36
* [83]
[Co(phen) 3 ] 3+/2+
0.40
0 °C
** [83]
0.327 ± 0.02
8 mM phen,
1 M KCl
* [83]
0.349
7.5
0.02 M Tris,
0.1 M KCl
[90]
[OsCl(1-Me-im)(bpy) 2 ] 3+/2+
0.312
7.0
0.1 M
phosphate
[84]
[OsCl(im)(bpy) 2 ] 3+/2+
0.304
7.0
0.1 M
phosphate
[84]
[Co(5-Me-phen) 3 ] 3+/2+
0.293
7.5
0.02 M Tris,
0.1 M KCl
[90]
[Co(trdta)] 1−/2−
0.29
* [83]
[Ru(NH 3 ) 5 (py)] 3+/2+
0.305
1 M NaCl
* [83]
0.289
5.0
5 mM acetate,
0.2 M NaCl
[85]
[Co(bpy) 3 ] 2+/3+
0.34
0 °C
* [83]
0.281
7.5
0.02 M Tris,
0.1 M KCl
[90]
[Ru(NH 3 ) 5 (4-thmpy)] 3+/2+
0.281
5.0
5 mM acetate,
0.2 M NaCl
[85]
Fe 3+/2+ , malonate
0.26
4
* [91]
Fe 3+/2+ , salicylate
0.26
4
* [91]
[Ru(NH 3 ) 5 (4-Me-py)] 3+/2+
0.252
5.0
5 mM acetate,
0.2 M NaCl
[85]
[Co(terpy) 2 ] 3+/2+
0.31
0 °C
* [83]
0.237
7.5
0.02 M Tris,
0.1 M KCl
[90]
[Co(4-Me-phen) 3 ] 3+/2+
0.236
7.5
0.02 M Tris,
0.1 M KCl
[90]
(continued)