Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1250, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2021.131679
Keywords
Room Temperature Ionic liquids; Chain Length effect; NTf2 conformation; Effect of Amide functionality; Raman spectroscopy
Categories
Funding
- CSIR-Delhi
- DMSRDE, Kanpur [CARS 101]
Ask authors/readers for more resources
A series of new room-temperature ionic liquids (RTILs) based on biodegradable pyridinium carboxamide cation and conformationally flexible NTf2 anion have been synthesized. The introduction of amide functionality on pyridinium cation moiety drastically changes the thermophysical properties and plays a crucial role in biodegradability. The dependence of thermal and physical properties on alkyl chain length, as well as the conformational dynamics of NTf2 anion, have been studied and correlated with experimental observations.
A series of new room-temperature ionic liquids (RTILs) based on biodegradable pyridinium carboxamide cation and conformationally flexible NTf2 anion have been synthesised. The variation of thermo-physical properties of these RTILs with alkyl chain length size has been studied and compared with corresponding parental pyridinium NTf2 ILs. A drastic change in thermophysical properties has been noted on the introduction of the amide functionality on pyridinium cation moiety. The crucial role of amide functionality is also important concerning biodegradability as it acts as an active site for an enzymatic attack, helpful toward biodegradation. Besides, the dependence of thermal and physical properties on alkyl chain length is also noteworthy. A detailed DFT based theoretical studies substantiate the experimental observation of chain length dependence melting point variation and successfully correlated that with stabilisation energy. Conformational dynamics of NTf2 anion (between transoid and cisoid) has been elucidated by Raman spectroscopic studies. Interestingly, the data demonstrate that the conformation of NTf2 anion depends on the chain length of the cation, clearly indicating anionic interaction with the hydrophobic region of the cation. This information is crutial as it vindicates the fact that multiple weak interaction do exist in ILs making it a complex nonostructured system composed of ions. (C) 2021 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available