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The controllable nanostructure and photocatalytic behaviour of 5,10,15,20-tetra-(3,4,5 trimethoxyphenyl)porphyrin through solvophobic supramolecular self-assembly

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Abstract

In this study, the self-assembly of 5,10,15,20-tetra(3,4,5-trimethoxyphenyl)porphyrin (coded as: TTOP) in a mixture of tetrahydrofuran (THF) and H2O and the photocatalytic activity of the resulting self-assembled aggregates toward the degradation of organic compounds were investigated. TTOP was well dispersed as monomers in THF, however, it stacked into aggregates upon the addition of water (20–90%). Depending on the THF/H2O mixture various nanostructures were observed. Microrods with an average width of 0.62 ± 0.22 μm and length of 10.17 ± 2.04 μm and sphere-like particles with diameters ranging from 0.5 to 1.2 μm were obtained in 70% water in THF. Nonetheless, the particles disappeared and the rods turned to slabs with the same length but much larger width (4.48 ± 2.27 μm) when 80% water in THF was used. Particles with irregular shapes, which connected into large aggregates, were obtained at 90% water in THF. These structures exhibited a significant difference in photocatalytic ability for the degradation of dye (rohdamine B, RhB and methylene blue, MB). The rate constants of RhB degradation were 4.35 × 10−4 min−1, 1.13 × 10−3 min−1, 2.63 × 10−3 min−1, and 3.52 × 10−3 min−1 for the porphyrin monomer in THF and its aggregate states obtained by mixing 70%, 80%, and 90% water in THF, respectively. These results indicated the important role of solvent in the formation and control of the structures of porphyrin aggregates, which are crucial to an effective porphyrin-based photocatalyst.

Graphical abstract: The controllable nanostructure and photocatalytic behaviour of 5,10,15,20-tetra-(3,4,5 trimethoxyphenyl)porphyrin through solvophobic supramolecular self-assembly

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Article information


Submitted
04 Jul 2020
Accepted
27 Sep 2020
First published
28 Sep 2020

New J. Chem., 2020, Advance Article
Article type
Paper

The controllable nanostructure and photocatalytic behaviour of 5,10,15,20-tetra-(3,4,5 trimethoxyphenyl)porphyrin through solvophobic supramolecular self-assembly

R. W. Jadhav, D. Duc La, T. N. Truong, S. V. Khalap, D. V. Quang and S. V. Bhosale, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ03355C

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