scholarly journals pH dependent photocatalytic hydrogen evolution by self-assembled perylene bisimides

2017 ◽  
Vol 5 (16) ◽  
pp. 7555-7563 ◽  
Author(s):  
Michael C. Nolan ◽  
James J. Walsh ◽  
Laura L. E. Mears ◽  
Emily R. Draper ◽  
Matthew Wallace ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Self Assembly ◽  
The Self ◽  
Photocatalytic Hydrogen Evolution ◽  
Perylene Bisimide ◽  
Ph Dependent ◽  
Self Assembled ◽  
Perylene Bisimides

We show the importance of the self-assembly of a perylene bisimide on its photocatalytic activity.

Controlling Activity by Self-Assembly – Tuning Perylene Bisimide Photocatalysts for the Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Daniel McDowall ◽  
Ben Greeves ◽  
Kate McAulay ◽  
Ana Fuentes-Caparros ◽  
Lisa Thomson ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Self Assembly ◽  
Local Environment ◽  
Perylene Bisimide ◽  
Hole Scavenger ◽  
Self Assembled ◽  
Set Up ◽  
Perylene Bisimides

Amino acid functionalised perylene bisimides (PBIs) form self-assembled structures in solution, the nature of which depends on the local environment. Using a high throughput photocatalysis set-up, we have studied five PBIs for the hydrogen evolution reaction (HER) under a range of conditions (pH and hole scavenger concentration) across 350 experiments to explore the relationship between supramolecular structure and photocatalytic activity. Using small angle X-ray scattering (SAXS), we show that photocatalytic activity is determined by the nature of the self-assembled aggregate that is formed with a correlation between the presence of charged flexible cylindrical aggregates and high levels of H2. Our work highlights the complexity of designing supramolecular photocatalysts, and also the power of tuning activity by the type of aggregate that is formed.

Controlling Activity by Self-Assembly – Tuning Perylene Bisimide Photocatalysts for the Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Daniel McDowall ◽  
Ben Greeves ◽  
Kate McAulay ◽  
Ana Fuentes-Caparros ◽  
Lisa Thomson ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Self Assembly ◽  
Local Environment ◽  
Perylene Bisimide ◽  
Hole Scavenger ◽  
Self Assembled ◽  
Set Up ◽  
Perylene Bisimides

Amino acid functionalised perylene bisimides (PBIs) form self-assembled structures in solution, the nature of which depends on the local environment. Using a high throughput photocatalysis set-up, we have studied five PBIs for the hydrogen evolution reaction (HER) under a range of conditions (pH and hole scavenger concentration) across 350 experiments to explore the relationship between supramolecular structure and photocatalytic activity. Using small angle X-ray scattering (SAXS), we show that photocatalytic activity is determined by the nature of the self-assembled aggregate that is formed with a correlation between the presence of charged flexible cylindrical aggregates and high levels of H2. Our work highlights the complexity of designing supramolecular photocatalysts, and also the power of tuning activity by the type of aggregate that is formed.

scholarly journals Insight into the Self-Assembly of Water-Soluble Perylene Bisimide Derivatives Through a Combined Computational and Experimental Approach

2019 ◽  
Author(s):  
Emily R. Draper ◽  
Liam Wilbraham ◽  
Dave J. Adams ◽  
Matthew Wallace ◽  
Martijn Zwijnenburg
Keyword(s):  
Density Functional Theory ◽  
Self Assembly ◽  
Density Functional ◽  
Colloidal Stability ◽  
Water Soluble ◽  
The Self ◽  
Functional Theory ◽  
Perylene Bisimide ◽  
Aggregate Growth ◽  
Perylene Bisimides

We use a combination of computational and experimental techniques to study the self-assembly and gelation of water-soluble perylene bisimides derivatised at the imide position with an amino acid. Specifically, we study the likely structure of self-assembled aggregates of the alanine-functionalised perylene bisimide (PBI-A) and the thermodynamics of their formation using density functional theory and predict the UV-vis spectra of such aggregates using time-dependent density functional theory. We compare these predictions to experiments in which we study the evolution of the UV-Vis and NMR spectra and rheology of alkaline PBI-A solutions when gradually decreasing the pH. Based on the combined computational and experimental results, we show that PBI-A self-assembles at all pH values but that aggregates grow in size upon protonation. Gelation is driven not by aggregate growth but reduction of the aggregation surface-charge and a decrease in the colloidal stability of the aggregation with respect to agglomeration.

scholarly journals Insight into the self-assembly of water-soluble perylene bisimide derivatives through a combined computational and experimental approach

Nanoscale ◽  
2019 ◽  
Vol 11 (34) ◽  
pp. 15917-15928 ◽  
Author(s):  
Emily R. Draper ◽  
Liam Wilbraham ◽  
Dave J. Adams ◽  
Matthew Wallace ◽  
Ralf Schweins ◽  
...  
Keyword(s):  
Amino Acid ◽  
Self Assembly ◽  
Experimental Approach ◽  
Water Soluble ◽  
The Self ◽  
Experimental Techniques ◽  
Perylene Bisimide ◽  
Perylene Bisimides ◽  
Insight Into

We use a combination of computational and experimental techniques to study the self-assembly and gelation of amino-acid functionalised water-soluble perylene bisimides.

scholarly journals Insight into the Self-Assembly of Water-Soluble Perylene Bisimide Derivatives Through a Combined Computational and Experimental Approach

2019 ◽  
Author(s):  
Emily R. Draper ◽  
Liam Wilbraham ◽  
Dave J. Adams ◽  
Matthew Wallace ◽  
Martijn Zwijnenburg
Keyword(s):  
Density Functional Theory ◽  
Self Assembly ◽  
Density Functional ◽  
Colloidal Stability ◽  
Water Soluble ◽  
The Self ◽  
Functional Theory ◽  
Perylene Bisimide ◽  
Aggregate Growth ◽  
Perylene Bisimides

We use a combination of computational and experimental techniques to study the self-assembly and gelation of water-soluble perylene bisimides derivatised at the imide position with an amino acid. Specifically, we study the likely structure of self-assembled aggregates of the alanine-functionalised perylene bisimide (PBI-A) and the thermodynamics of their formation using density functional theory and predict the UV-vis spectra of such aggregates using time-dependent density functional theory. We compare these predictions to experiments in which we study the evolution of the UV-Vis and NMR spectra and rheology of alkaline PBI-A solutions when gradually decreasing the pH. Based on the combined computational and experimental results, we show that PBI-A self-assembles at all pH values but that aggregates grow in size upon protonation. Gelation is driven not by aggregate growth but reduction of the aggregation surface-charge and a decrease in the colloidal stability of the aggregation with respect to agglomeration.

scholarly journals Controlling Photocatalytic Activity by Self‐Assembly – Tuning Perylene Bisimide Photocatalysts for the Hydrogen Evolution Reaction

2020 ◽  
Vol 10 (46) ◽  
pp. 2002469
Author(s):  
Daniel McDowall ◽  
Benjamin J. Greeves ◽  
Rob Clowes ◽  
Kate McAulay ◽  
Ana M. Fuentes‐Caparrós ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Self Assembly ◽  
Perylene Bisimide

Development of a framework catalyst for photocatalytic hydrogen evolution

2018 ◽  
Vol 54 (10) ◽  
pp. 1174-1177 ◽  
Author(s):  
Pondchanok Chinapang ◽  
Masaya Okamura ◽  
Takahiro Itoh ◽  
Mio Kondo ◽  
Shigeyuki Masaoka
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
Self Assembly ◽  
The Self ◽  
Photocatalytic Hydrogen Production ◽  
Photocatalytic Hydrogen Evolution

The self-assembly of a catalyst module afforded a novel framework catalyst with long-lived activity and reusability for photocatalytic hydrogen production.

scholarly journals Impact of subtle change in branched amino acid on the assembly and properties of perylene bisimide hydrogels

2021 ◽  
Author(s):  
Jacquelyn Grace G Egan ◽  
Glen Brodie ◽  
Daniel McDowall ◽  
Andrew J Smith ◽  
Charlotte J. C. Edwards-Gayle ◽  
...  
Keyword(s):  
Optical Properties ◽  
Amino Acid ◽  
Chemical Structure ◽  
The Self ◽  
Subtle Change ◽  
Perylene Bisimide ◽  
Self Assembled ◽  
Perylene Bisimides

Here in we investigate how apparent slight changes to the chemical structure of amino acid-functionalized perylene bisimides (PBIs) affect the self-assembled aggregates formed and their resulting physical and optical properties....

scholarly journals Insight into the Self-Assembly of Water-Soluble Perylene Bisimide Derivatives Through a Combined Computational and Experimental Approach

2019 ◽  
Author(s):  
Emily R. Draper ◽  
Liam Wilbraham ◽  
Dave J. Adams ◽  
Matthew Wallace ◽  
Martijn Zwijnenburg
Keyword(s):  
Density Functional Theory ◽  
Self Assembly ◽  
Density Functional ◽  
Colloidal Stability ◽  
Water Soluble ◽  
The Self ◽  
Functional Theory ◽  
Perylene Bisimide ◽  
Aggregate Growth ◽  
Perylene Bisimides

We use a combination of computational and experimental techniques to study the self-assembly and gelation of water-soluble perylene bisimides derivatised at the imide position with an amino acid. Specifically, we study the likely structure of self-assembled aggregates of the alanine-functionalised perylene bisimide (PBI-A) and the thermodynamics of their formation using density functional theory and predict the UV-vis spectra of such aggregates using time-dependent density functional theory. We compare these predictions to experiments in which we study the evolution of the UV-Vis and NMR spectra and rheology of alkaline PBI-A solutions when gradually decreasing the pH. Based on the combined computational and experimental results, we show that PBI-A self-assembles at all pH values but that aggregates grow in size upon protonation. Gelation is driven not by aggregate growth but reduction of the aggregation surface-charge and a decrease in the colloidal stability of the aggregation with respect to agglomeration.

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

2020 ◽  
Vol 44 (42) ◽  
pp. 18442-18448
Author(s):  
Ratan W. Jadhav ◽  
Duong Duc La ◽  
Tuan Ngoc Truong ◽  
Shambhu V. Khalap ◽  
Dang Viet Quang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Organic Compounds ◽  
Self Assembly ◽  
The Self ◽  
Self Assembled

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.

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