標題: Evidence of C-F-P and aromatic pi-F-P weak interactions in imidazolium ionic liquids and its consequences
作者: Panja, Sumit Kumar
Srivastava, Nitin
Srivastava, Jyoti
Prasad, Namburi Eswara
Noothalapati, Hemanth
Shigeto, Shinsuke
Saha, Satyen
應用化學系
Department of Applied Chemistry
關鍵字: Ionic liquids (ILs);Aromatic and aliphatic H-bonding interaction;Weak interactions;C-F-P interaction
公開日期: 5-Apr-2018
摘要: A simple change from alkyl group to alkene in side chain of imidazolium cation with same anion resulted in a drastic impact on physical properties (e.g., melting point) from bmimPF(6) IL to cmimPF(6) IL The underlying reasons have been elucidated by structural and interaction studies with the help of DSC, SCXRD, vibrational and multi-nuclear NMR spectroscopic techniques. Experiments reveal existence of new weak interactions involving the carbon and pi cloud of the imidazolium aromatic ring with fluoride of PF6 anion (i.e., C-2-F-P and pi-F-P) in cmimPF(6) but are absent in structurally similar prototype IL bmimPF(6). Though weak, these interactions helped to form ladder type supramolecular arrangement, resulting in quite high melting point for cmimPF(6) IL compared to bmimPF(6) IL These findings emphasize that an IL system can behave uniquely because of the existence of uncommon weak interactions. (C) 2017 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.saa.2017.12.048
http://hdl.handle.net/11536/144532
ISSN: 1386-1425
DOI: 10.1016/j.saa.2017.12.048
期刊: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume: 194
起始頁: 117
結束頁: 125
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