82
4 Technetium Coordinated by Organic Ligands …
Table 4.3
Electrochemical characteristics of selected technetium compounds (list of abbreviation and acronyms below the table)
Complex
Oxidation states
and E1/2
(or E
0’
) / V
Medium
Remarks
Reference
trans[Tc(diphos)2X2]
+
III/II
X: Cl
Br
0.040
0.068
0.5 M TEAP in DMF
E vs. NaSCE
(Hurst 1981)
trans[Tc(diars)2X2]
+
III/II
X: Cl
Br
I
0.091; 0.010; 0.105
trans[Tc(diars)2X2]
II/I
X: Cl
Br
I
1.29;
1.15; 1.01
trans[Tc(dppb)2Cl2]
+
[Tc(dppe)2Cl2]
+
III/II
0.092
0.001
0.5 M TEAP in DMF
E vs. Ag,AgCl (3 M NaCl);
peak potential of irrev. reduction
at
1.070 (or
1.080 V)
(Libson 1983)
trans[TcD2X2]
+
III/II
D: dmpe dmpe depe depe
X: Cl
Br
Cl
Br
0.231; 0.098; 0.260; 0.131
0.190
0.045
0.5 M TEAP in DMF
0.5 M TEACl in DMF
0.5 M TEABr in DMF
E vs. Ag,AgCl (3 M NaCl);
(Ichimura 1984)
trans[TcD2X2]
II/I
D: dmpe dmpe depe depe
X: Cl
Br
Cl
Br
1.410; 1.268; 1.439
;
1.289
0.5 M TEAP in DMF
at low temp (-40 0
C)
(continued)