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A density functional theory study on the interactions between dibenzothiophene and tetrafluoroborate-based ionic
Jin Lin1, Renqing Lü2, Chongchong Wu3
1College of Chemical Engineering, China University of Petroleum (East China), 266580, Qingdao, Shandong Province, China.
Journal of Molecular Modeling
|April 2, 2017
Summary
This study explores interactions between dibenzothiophene (DBT) and various ionic liquids. Aromatic cations in ionic liquids significantly enhance interaction energies with DBT, primarily through hydrogen bonds and van der Waals forces.
Area of Science:
- Computational Chemistry
- Materials Science
- Chemical Engineering
Background:
- Dibenzothiophene (DBT) is a key compound in hydrodesulfurization processes.
- Ionic liquids (ILs) offer tunable properties for various chemical applications.
- Understanding DBT-IL interactions is crucial for optimizing desulfurization technologies.
Purpose of the Study:
- To investigate the intermolecular interactions between DBT and five different ionic liquids.
- To elucidate the types and strengths of interactions governing these systems.
- To identify the role of cation structure in DBT-IL interactions.
Main Methods:
- Density Functional Theory (DFT) calculations were employed.
- Natural Bond Orbital (NBO) analysis was used to study electronic properties.
- Atoms in Molecules (AIM) theory and noncovalent interaction (NCI) methods were applied.
Main Results:
- Hydrogen bond and van der Waals interactions are prevalent in all DBT-IL systems.
- Ion-π interactions were observed between DBT and both cations and anions.
- π+-π interactions were identified exclusively in systems with aromatic cations ([BMIM][BF4] and [BPY][BF4]).
- Interaction energies were highest for DBT with [BPY][BF4] and [BMIM][BF4], indicating stronger binding with aromatic cations.
Conclusions:
- Ionic liquids with aromatic cations exhibit significantly stronger interactions with DBT.
- The combination of DFT, NBO, AIM, and NCI methods provides a comprehensive understanding of DBT-IL interactions.
- These findings can guide the design of more efficient ionic liquids for DBT removal.