This study used density functional theory (DFT) calculations to investigate the properties of four novel dianionic ionic liquids (DAILs) named as [PMIM]2[TFTP], [PMTA1]2[TFTP], [PMTA2]2[TFTP] and [PMTTA]2[TFTP]. These DAILs consist of a tetrafluoro terephthalate ([TFTP]2-) dianion and various functionalized imidazolium, triazolium and tetrazolium-based cations allowing for an analysis of how cation structure (specifically nitrogen atom number and position) and fluorination affect the DAILs' stability, electronic properties, and electrochemical behavior. The research evaluated energetic, electronic, and thermodynamic parameters, as well as electrostatic potential maps and topological properties, to understand the relationship between DAIL structure and its characteristics. The fluorinated dianion showed a planar preference for interaction with the cation's five-membered rings. Importantly, hydrogen bonding, in conjunction with electrostatic interactions, significantly contributes to the stability of these DAILs and will likely influence their physicochemical properties and suitability for specific applications. The interaction energies for the most stable configurations of the examined DAILs vary between -235.82 and -269.36 kcal mol-1 at M06–2X-GD3/AUG-cc-pVDZ theory level and following a decreasing trend in the order of: [PMIM]2[TFTP] < [PMTA1]2[TFTP] < [PMTA2]2[TFTP] < [PMTTA]2[TFTP]. Additionally, the HOMO–LUMO energy gaps, spanning from 6.49 to 7.38 eV, highlighted notable stability trends in the series. Charge transfer values obtained through NBO analysis were observed between 0.2318 and 0.7307 a.u., reaffirming the contributions of hydrogen bonding.
扫码关注我们
求助内容:
应助结果提醒方式:
