Methylviologen dications (MV2+) were immobilized between layers of manganese oxide during their electrochemical assembly by an anodic route in a homogeneous aqueous Mn2+ solution. This approach yielded a well-ordered multilayer film on a platinum substrate as a result of dense packing of planar MV2+ molecules to stabilize the layered framework. A grazing angle in-plane X-ray diffraction study revealed that the manganese oxide sheets and the molecular planes of inserted MV2+ ions are oriented parallel to the electrode surface. Cyclic voltammetry of the product film indicated an electron transfer from the underlying Pt substrate to inserted methylviologen ions through the manganese oxide sheets.
Potentiostatic electrolysis of a mixed aqueous solution of MnSO 4 and cationic porphyrin at +1.0 V (vs Ag/AgCl) on a Pt electrode resulted in the deposition of layered manganese oxide. Porphyrin molecules are intercalated between Mn oxide layers as a cation form, resulting in a stacking with a repeating periodicity of 0.82 nm.
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