Photosensitizers for H2 Evolution Based on Charged or Neutral Zn and Sn Porphyrins.,Inorganic Chemistry

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Photosensitizers for H2 Evolution Based on Charged or Neutral Zn and Sn Porphyrins.
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-01-15 , DOI: 10.1021/acs.inorgchem.9b01838
Emmanouil Giannoudis _{1,

2} , Elisabetta Benazzi ₃ , Joshua Karlsson ₃ , Graeme Copley ₃ , Stylianos Panagiotakis ₁ , Georgios Landrou ₁ , Panagiotis Angaridis ₄ , Vasilis Nikolaou ₁ , Chrysanthi Matthaiaki ₁ , Georgios Charalambidis ₁ , Elizabeth A Gibson ₃ , Athanassios G Coutsolelos ₁

Affiliation

We report a comparison between a series of zinc and tin porphyrins as photosensitizers for photochemical hydrogen evolution using cobaloxime complexes as molecular catalysts. Among all the chromophores tested, only the positively charged zinc porphyrin, [ZnTMePyP4+]Cl4, and the neutral tin porphyrin derivatives, Sn(OH)2TPyP, Sn(Cl2)TPP-[COOMe]4, and Sn(Cl2)TPP-[PO(OEt)2]4, were photocatalytically active. Hydrogen evolution was strongly affected by the pH value as well as the different concentrations of both the sensitizer and the catalyst. A comprehensive photophysical and electrochemical investigation was conducted in order to examine the mechanism of photocatalysis. The results derived from this study establish fundamental criteria with respect to the design and synthesis of porphyrin derivatives for their application as photosensitizers in photoinduced hydrogen evolution.

中文翻译：

基于带电或中性的锌和锡卟啉的H2释放光敏剂。

我们报告了一系列的锌和锡卟啉作为光敏剂之间的比较，这些光敏剂使用钴肟肟配合物作为分子催化剂来进行光化学氢释放。在所有测试的生色团中，仅带正电荷的锌卟啉，[ZnTMePyP4 +] Cl4和中性锡卟啉衍生物，Sn（OH）2TPyP，Sn（Cl2）TPP- [COOMe] 4和Sn（Cl2）TPP- [ PO（OEt）2] 4，具有光催化活性。pH值以及敏化剂和催化剂的不同浓度对氢气的释放有很大的影响。为了检查光催化的机理，进行了全面的光物理和电化学研究。

更新日期：2020-01-16

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