Abstract
A one-photon two-electron process was made possible in photocatalytic H2 evolution from ascorbic acid with a cobalt(II) chlorin complex [Co(II)(Ch)] via electron transfer from ascorbate to the excited state of [Ru(bpy)3](2+) followed by electron transfer from [Ru(bpy)3](+) to Co(II)(Ch) with proton to give the hydride complex, which reacts with proton to produce H2. [Co(III)(Ch)](+) was reduced by ascorbate to reproduce Co(II)(Ch).
Highlights
A one-photon two-electron process was made possible in photocatalytic H2 evolution from ascorbic acid with a cobalt(II) chlorin complex [CoII(Ch)] via electron transfer from ascorbate to the excited state of [Ru(bpy)3]2+ followed by electron transfer from [Ru(bpy)3]+ to CoII(Ch) with proton to give the hydride complex, which reacts with proton to produce H2. [CoIII(Ch)]+ was reduced by ascorbate to reproduce CoII(Ch)
We report photocatalytic H2 evolution from ascorbic acid (AscH2) with a cobalt(II) chlorin complex [CoII(Ch)]19 in an aqueous acetonitrile solution (H2O/MeCN), which proceeds via a one-photon two-electron process
To examine the reaction of [CoI(Ch)]À that is produced by electron transfer from [Ru(bpy)3]+ to CoII(Ch), [CoI(Ch)]À was prepared by the one-electron reduction of CoII(Ch) by decamethylcobaltocene [Co(Cp*)2] in MeCN (Fig. S7 in Electronic supplementary information (ESI)†)
Summary
A one-photon two-electron process was made possible in photocatalytic H2 evolution from ascorbic acid with a cobalt(II) chlorin complex [CoII(Ch)] via electron transfer from ascorbate to the excited state of [Ru(bpy)3]2+ followed by electron transfer from [Ru(bpy)3]+ to CoII(Ch) with proton to give the hydride complex, which reacts with proton to produce H2. [CoIII(Ch)]+ was reduced by ascorbate to reproduce CoII(Ch). We report photocatalytic H2 evolution from ascorbic acid (AscH2) with a cobalt(II) chlorin complex [CoII(Ch)] (a chemical structure shown in Scheme 1)[19] in an aqueous acetonitrile solution (H2O/MeCN), which proceeds via a one-photon two-electron process.
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