34
2 MET-Type Bioelectrocatalysis
Table 2.1 Formal potentials metal complexes in aqueous solution
Compound *1
E° /V versus
SHE
pH
Conditions *2 References
Water soluble Fe porphyrin *3 (Fe:
4 + /3 + )
1.341
5.0
I = 0.2
[82]
[Os(terpy) 3 ] 3+/2+
0.987
* [83]
[Rh(CN) 6 ] 3−/4−
0.9
(standard
potential)
* [83]
[Os(terpy)(bpy)(py)] 3+/2+
0.871
* [83]
[Os(py) 2 (bpy) 2 ] 3+/2+
0.834
* [83]
[Os(bpy) 3 ] 3+/2+
0.885
* [83]
0.815
7.0
0.1 M
phosphate
[84]
[Os(bpy)(py) 4 ] 3+/2+
0.805
* [83]
IrBr 6
2−/3−
0.805 ± 0.001
(standard
potential)
* [83]
[Os(terpy)py 3 ] 3+/2+
0.800
* [83]
[Mo(CN) 8 ] 3−/4−
0.778
* [86]
[Fe(bpy)] 3+/2+
0.76
5.3
8 mM MES
* [86]
0.780
* [86]
[Os(4,4 -Me 2 -bpy) 3 ] 3+/2+
0.638
7.0
0.1 M
phosphate
[84]
[Co(ox) 3 ] 3−/4−
0.057 ± 0.02
1 M KCl
* [83]
[Os(terpy)(bpy)Cl] 2+/1+
0.563
* [83]
[W(CN) 8 ] 3−/4−
0.52
7
0.1 M
phosphate,
0.1 M KCl
[87]
[Os(2-Me-im) 2 (bpy) 2 ] 3+/2+
0.502
7.0
0.1 M
phosphate
[84]
ferrocene dicarboxylate
0.501
7.0
0.1 M
phosphate
[84]
0.513
7
0.05 M
phosphate, I
= 0.1
[88]
[Os(im) 2 (bpy) 2 ] 3+/2+
0.487
7.0
0.1 M
phosphate
[84]
[Os(4-Me-im) 2 (bpy) 2 ] 3+/2+
0.453
7.0
0.1 M
phosphate
[84]
OsBr 6
2−/3−
0.45
* [83]
[Fe(CN) 6 ] 3−/4−
0.710
1 M HCl
[89]
0.560
0.1 M HCl
[89]
0.443
* [86]
(continued)