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Issue 26, 2020
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Asymmetric zinc porphyrin derivatives bearing three pseudo-pyrimidine meso-position substituents and their photosensitization for H2 evolution

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Abstract

Novel asymmetric zinc porphyrin derivatives (ZnPy-5 and ZnPy-6) with meso-positions bearing one benzoic acid and three pseudo-pyrimidines with two N atoms located at different positions were synthesized and utilized as sensitizers for Pt-loaded g-C3N4 (PCN). Compared to the analogue (ZnPy-1 bearing one benzoic acid and three phenyl meso-position substituents), ZnPy-5 and ZnPy-6 exhibit significantly enhanced photosensitization on PCN under visible light (λ ≥ 420 nm) illumination. In particular, ZnPy-5/PCN and ZnPy-6/PCN exhibit H2 evolution activities of 418 and 585 μmol h−1, corresponding to turnover numbers (TON) of 8845 and 12 381 h−1, respectively. Both of these values are much better that (316 μmol h−1) of ZnPy-1/PCN, which has a TON of 6687 h−1. In addition, ZnPy-5/PCN and ZnPy-6/PCN show apparent quantum yields of 32.6% and 33.1% at 420 nm monochromatic light, and these are much higher than that (10.6%) for ZnPy-1/PCN. Compared with ZnPy-5, the two N atoms of the pseudo-pyrimidines in ZnPy-6 are further away from the porphyrin macrocycle, which can more effectively combine with the sacrificial reagent and g-C3N4, thus promoting dye regeneration and the photoexcited charge transfer for delivering better photocatalytic performance. The present results demonstrate that the number and positions of the N atoms in the peripheral substituents of the porphyrin derivatives have a great influence on the photosensitization, and that the fine-tuning of molecular structures is crucial for improving the H2 evolution activity of the dye-sensitized semiconductors.

Graphical abstract: Asymmetric zinc porphyrin derivatives bearing three pseudo-pyrimidine meso-position substituents and their photosensitization for H2 evolution

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Supplementary files

Article information


Submitted
23 Apr 2020
Accepted
29 May 2020
First published
11 Jun 2020

New J. Chem., 2020,44, 11237-11247
Article type
Paper

Asymmetric zinc porphyrin derivatives bearing three pseudo-pyrimidine meso-position substituents and their photosensitization for H2 evolution

P. Zeng, Y. Zheng, S. Chen, H. Liu, R. Li and T. Peng, New J. Chem., 2020, 44, 11237
DOI: 10.1039/D0NJ02056G

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