86
4 Technetium Coordinated by Organic Ligands …
Table 4.3
(continued)
cis-[Tc(SC6H5)2(diars)2]
+
trans-[Tc(SCH2C6H5)2(diars)2]
+
-[Tc(SCH3)2(diars)2]
+
III/II;
II/I
0.322;
1.22
0.362;
1.56
0.465;
1.70
0.5 M TEAP in DMF
E vs. Ag,AgCl (3 M NaCl)
Tc(III) is irrev. ox. at Epa
= 0.941.08 V;
(Konno 1992)
[Tc(tdt) (dmpe)2]
+
IV/III;
III/II;
II/I
0.680;
0.600;
1.217
0.5 M TEAP in DMF
E vs. Ag,AgCl(3 M NaCl)
Tc(IV)/Tc(III) couple is quasi-rev.
(Konno 1992a)
[Tc(dppbt)3]
[TcOCl(dppbt)2]
V/IV;
IV/III;
III/II
1.266

; 0.506

; 0.581

0.497

0.2 M TBABF4 in DCM
E vs. Fc,Fc
+
;

potential of anodic
peak;

at -80
0
C;
(Dilworth 1992)
[M(9S3)2L’’]
+
[M(9S3)2]
2+
III/II;
II/I
1.08;
1.958

0.87

;
0.38

0.1 M TBABF4 in ACN
E vs. Fc,Fc
+
;

quasi-rev.;

irrev.
(White 1992,
Mullen 2000)
trans-[Tc(SC2H5)2(dmpe)2]
-[Tc(S-n-C3H7)2(dmpe)2]
-[Tc(SCH2C6H5)2(dmpe)2]
-[Tc(SCH2C6H4-p-OCH3)2(dmpe)2]
cis-[Tc(SC6H4-p-Cl)2(dmpe)2]
-[Tc(SC6H5)2(dmpe)2]
-[Tc(SC6H4-p-OCH3)2(dmpe)2]
+
-[Tc(SC6H4-p-t-Bu)2(dmpe)2]
+
III/II;
II/I
0.566;
1.75
0.622;
1.85
0.513;
1.68
0.559;
1.72
0.182;
1.07

0.299;
1.11

0.350;
1.21

0.382;
1.20

0.5 M TBAP in DMF
0.5 M TEAP in DMF
E vs. Ag,AgCl (3 M NaCl);
for trans-Tc(III) irrev. ox. at 0.870.92 V; this process becomes rev.
for Tc-(SC2H5)
or Tc-(S-nC3H7) at
low temp (-70
0
C);

Epc or Epa;
(Konno 1989, 1989a,
1993)
Complex
Oxidation states
and E1/2
(or E
0’
) / V
Medium
Remarks
Reference
(continued)