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

Abstract

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 selfassembly 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 noncovalent 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.

Saturated adsorption of lidocaine and coal tar dyes onto porous polytetrafluoroethylene

“…Shifts to lower wavelengths have been reported to exhibit π–π stacking and hydrophobic interactions in compounds with aromatic rings. 41 Furthermore, hydrophobic interactions of protein adsorption have been observed to shift to lower wavelengths. 42 We concluded that this blueshift indicates a hydrophobic interaction between the dyes and the porous PTFE.…”

High utilization efficiencies of alkylbenzokynones hybridized inside the pores of activated carbon for electrochemical capacitor electrodes

“…The interactions with the surfaces of graphene [42][43][44][45][46][47] and graphene oxide [48][49][50][51][52] have been reported based on the p-p stacking, hydrophobic, electrostatic, and hydrogen-bonding interactions. 53,54 In the case of graphene oxide that has a variety of oxygen-containing functional groups, the electrostatic interaction is derived from the attracting force between positively and negatively charged functional groups, [49][50][51][52] while the hydrogen bonding is induced between polar functional groups and/or polar molecular moieties.…”

Carbon Nanomaterials for Wastewater Treatment

“…This provided another way to influence the adsorption properties of adsorbents by taking different types of solvents. To analyze the effect of solvent properties on adsorption, the adsorption studies were carried out by varying the self-assembled structures of biopolymers in the presence of different solvents [117]. The adsorption properties of biopolymer-modified rGO exhibited variation due to differences in self-assembled structures of chlorophills on the surface of rGO.…”