Self-Assembled Naphthalimide-Substituted Porphyrin Nanowires for Photocatalytic Hydrogen Evolution

Abstract

A linear 5,15-di(naphthalimide) substituted porphyrin ZnD(p-NI)PP is facilely self-assembled into nanowires in solid with well-defined morphology through the synergistic π−π stack interactions of both porphyrin and naphthalimide skeletons. The self-assembled porphyrin nanowires feature broadened light absorption, efficient separation and transfer of photogenerated charges, and enhanced photostability. As a consequence, the ZnD(p-NI)PP produced 108 times higher H 2 production rate (ηH 2 = 5.40 mmol g −1 h −1 ) than the control 5,15-diphenylporphyrin (ZnDPP) (ηH 2 = 0.05 mmol g −1 h −1 ) and 3.6-fold higher than the ZnT(p-NI)PP (ηH 2 = 1.50 mmol g −1 h −1 ) which bears four NI units and self-assembled into nanospheres in the solid. Additionally, the photocatalytic system of ZnD(p-NI)PP produced hydrogen evolution up to 50 h, while the hydrogen evolution of the ZnDPP photocatalytic system reached a plateau after 20 h.

Metalloporphyrin-Decorated Titanium Dioxide Nanosheets for Efficient Photocatalytic Carbon Dioxide Reduction

“…Self-assembly photocatalysis with excellent activity has drawn wide attention in recent years. − In this work, MTCPP/TiO 2 was fabricated by a layer-by-layer self-assembly process. First, abundant carboxyl and hydroxyl on porphyrin were adsorbed by metal ions.…”

Shape dependent photocatalytic H2 evolution of a zinc porphyrin

“…[12][13][14][15][16][17][18][19][20] There are a few examples reported in the literature in the field of the photocatalytic hydrogen production, where the self-assembled structures feature greater photocatalytic activity compared to the monomeric species, possibly due to their enhanced light capture. [21][22][23][24][25] In this report we synthesized a simple zinc(II) tetraphenyl porphyrin, ZnTPP and studied three different self-assembled architectures obtained with the use of a "bad"/"good" solvent protocol. Then we investigated the impact of the different shapes formed, in hydrogen evolution experiments under visible light irradiation.…”

Self-Assembly of Porphyrin Dipeptide Conjugates toward Hydrogen Production

“…Interestingly, although natural photosynthesis is achieved through the well-organized self-assembly of chlorophylls, in the literature, there are not many reports that investigate H 2 production via the self-assembly of chromophores. − This is a promising approach to enhance photocatalytic hydrogen evolution activity, since the self-assembled chromophores have illustrated superior light-harvesting ability owing to their improved absorption features and their increased photostability …”