4.2 Aqueous Solutions
89
Table 4.3
(continued)
[Cl(py)4Tc-O-Tc(py)Cl4]
[Br(py)4Tc-O-Tc(py)Br4]
[Cl(pic)4Tc-O-Tc(pic)Cl4]
[Br(pic)4Tc-O-Tc(pic)Br4]
[Cl(lut)4Tc-O-Tc(lut)Cl4]
[Cl(pyr)3ClTc-O-Tc(py)Cl3(pyr)]
[Br(py)3BrTc-O-Tc(py)Br3(pyr)]
[Cl(pic)3ClTc-O-Tc(pic)Cl3(pic)]
[Br(pic)3BrTc-O-Tc(pic)Br3(pic)]
IV-III/III-III III-III/III-II
0.864;
0.664
0.737;
0.515
0.74;
0.74
0.797;
0.551
0.840;
0.786
0.602;
0.539
0.679;
0.298
0.56;
0.54
0.612;
0.354
0.1 M TEAP in DMF
E vs. Ag,AgCl; after scaning over
selected potentials were observed
growing additional rev. and/or irrev.
peaks
(Clarke 1988)
{[(terpy)(Me2bpy)Tc]2(P-O)}
4+/2+
III-III/III-II III-II/II-II
0.14
0.39
TBAH in DMAc
E vs. NHE, additional one electron
quasi-rev. ox. at 1.24 V and one
electron irrever red. at
1.08 V
(Barrera 1996a)
(P-O)[Cl(bpy)2Tc]2
2+
(P-O)[Br(bpy)2Tc]2
2+
(P-O)[Cl(phen)2Tc]2
2+
(P-O)[(OH)(phen)2Tc]2
2+
IV-IV/IV-III;IV-III/III-III;III-III/III-II
0.810;
0.584
1.334;
0.666;
0.773
0.846;
0.570
1.362;
0.703;
0.712
0.814;
0.505
1.315;
0.651;
0.908
1.434;
0.814;
1.327;
0.658;
0.727
0.1 M LiCl/H2O
0.1 M TEAP in CAN
0.1 M LiCl/H2O
0.1 M TEAP in ACN
0.1 M LiCl/H2O
0.1 M TEAP in CAN
0.1 M HNO3
0.1 M TEAP in CAN
E vs. Fc,Fc
+
potential of irrev.
cathodic peak
(Lu 1993)
Complex
Oxidation states
and E1/2
(or E
0’
) / V
Medium
Remarks
Reference
(continued)