Synthesis, characterization and electrochemical polymerization of eight transition-metal complexes of 5-amino-1,10-phenanthroline
1997
The ability to prepare polymer films on the surface of glassy carbon
electrodes (GCEs) by electrochemical polymerization of transition-metal
complexes of 5-amino-1,10-phenanthroline (aphen) was investigated. Eight
different metal ions (Mn
II
, Fe
II
, Co
II
,
Ni
II
, Cu
II
, Zn
II
, Ru
II
and
Os
II
) were studied. A simple and rapid method for the
synthesis of the complexes with Mn
II
, Co
II
,
Ni
II
, Cu
II
and Zn
II
was also
elaborated. The surface coverage obtained through electrochemical
polymerization of the complexes on the GCEs can be related to the redox
potential of the metal. The iron(II) and
ruthenium(II) complexes generated the greatest polymer film
surface coverages (≈10
-8
mol cm
-2
),
followed by the osmium(II) and cobalt(II)
complexes (≈10
-9
mol cm
-2
).
Electrochemical polymerization studies with aphen,
5-nitro-1,10-phenanthroline (nphen) and the metal complex
[Fe(nphen)
3
]
2+
provided further evidence that the
oxidative electropolymerization mechanism for these complexes is
initiated by sweeping through the oxidative potential of the aphen
ligand (+1.35 V vs. Ag–AgCl).
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