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Solvent Effect on Supramolecular Self-Assembly of Chlorophylls a on Chemically Reduced Graphene Oxide

Solvent plays an important role in the surface interaction of molecules. In this study, we use “chlorophyll a”, an archetypical molecule, to investigate its supramolecular self-assembly with chemically reduced graphene oxide in three different types of solvents: polar protic, polar aprotic, and non-...

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Published in:Langmuir 2020-11, Vol.36 (45), p.13575-13582
Main Authors: Ramakrishna, Tejaswini R. B, Mathesh, Motilal, Liu, Zhen, Zhang, Chunmei, Du, Aijun, Liu, Jingquan, Barrow, Colin J, Chen, Min, Biggs, Mark J, Yang, Wenrong
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container_end_page 13582
container_issue 45
container_start_page 13575
container_title Langmuir
container_volume 36
creator Ramakrishna, Tejaswini R. B
Mathesh, Motilal
Liu, Zhen
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Chen, Min
Biggs, Mark J
Yang, Wenrong
description Solvent plays an important role in the surface interaction of molecules. In this study, we use “chlorophyll a”, an archetypical molecule, to investigate its supramolecular self-assembly with chemically reduced graphene oxide in three different types of solvents: polar protic, polar aprotic, and non-polar. It was observed that only a polar protic solvent that can donate protons facilitates the hydrogen bonding between chlorophyll a and chemically reduced graphene oxide nanosheets in a hybrid system. The formation of hydrogen bonds further initiates the other non-covalent interactions such as π–π stacking and hydrophobic interaction, which altogether play a key driving force for supramolecular self-assembly of chlorophylls on chemically reduced graphene oxides. The experimental results are strongly supported by density functional theory calculations, which show robust electron coupling between chlorophylls and chemically reduced graphene oxide.
doi_str_mv 10.1021/acs.langmuir.0c02370
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title Solvent Effect on Supramolecular Self-Assembly of Chlorophylls a on Chemically Reduced Graphene Oxide
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