Abstract
Unidirectional photocatalytic electron transfer from a hydrophilic electron donor encapsulated in the interior of a liposome, to a hydrophilic electron acceptor on the other side of the membrane, has been achieved using the simple membrane-soluble electron relay 1-methoxy-N-methylphenazinium (MMP(+)). The total amount of photoproduct (>140 nmol) exceeds the number of moles of MMP(+) present (125 nmol), thus showing that the transport of electrons is catalytic.
Highlights
Unidirectional photocatalytic electron transfer from a hydrophilic electron donor encapsulated in the interior of a liposome, to a hydrophilic electron acceptor on the other side of the membrane, has been achieved using the simple membrane-soluble electron relay 1-methoxy-N-methylphenazinium (MMP+)
To accomplish efficient artificial photosynthesis, two complimentary redox reactions must be fuelled by visible light irradiation
We envisioned that biomimetic liposomes containing a watersoluble electron donor in their interior and a photosensitizer in the membrane would be able to unidirectionally transport the photoelectrons to the WST1À molecules located outside the liposomes, provided that MMP+ is added to the system
Summary
Unidirectional photocatalytic electron transfer from a hydrophilic electron donor encapsulated in the interior of a liposome, to a hydrophilic electron acceptor on the other side of the membrane, has been achieved using the simple membrane-soluble electron relay 1-methoxy-N-methylphenazinium (MMP+). Scheme 1 Chemical structures of the membrane-insoluble electron acceptor 2-(4-iodophenyl)-3-(4-nitrophenyl)-5-(2,4-disulfophenyl)-2Htetrazolium anion (WST1À), the membrane-soluble electron relay 1-methoxyN-methylphenazinium cation (MMP+), their reduction products Fz12À and MMPH, respectively, and the lipophilic zinc porphyrin photosensitizer [1]4+.
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