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Molecular mobility in several imidazolium‐based ionic liquids according to data of 1 H and 13 C NMR relaxation
Author(s) -
Matveev Vladimir V.,
Markelov Denis A.,
Ievlev Alexandr V.,
Brui Ekaterina A.,
Tyutyukin Konstantin V.,
Lähderanta Erkki
Publication year - 2018
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4681
Subject(s) - chemistry , ionic liquid , relaxation (psychology) , ionic bonding , proton nmr , ion , carbon 13 nmr , hydrogen atom , atom (system on chip) , computational chemistry , analytical chemistry (journal) , stereochemistry , organic chemistry , catalysis , group (periodic table) , psychology , social psychology , computer science , embedded system
Temperature dependences are compared for 1 H and 13 C NMR 1/T 1 curves relaxation rates in three imidazolium‐based ionic liquids (ILs), namely, in [bmim]PF 6 , [bmim]BF 4 , and [emim]CH 3 COO. 13 C curves show alike behavior for all three ILs and follow a well‐known Bloembergen‐Pound‐Purcell (BPP) equation. On the contrary, an essential part of 1 H curves differ strongly from corresponding 13 C ones and also have different shapes for different ILs. For the first time, we have detected the specific, two‐maximum shape of 1 H relaxation curve for hydrogen atom of C(2)H group of the [emim]CH 3 COO. Assuming that this maximum reflects the correlated rotation of several adjoining ion pairs, we have tried to destroy this rotation by addition of glycerol to the [emim]CH 3 COO. The second, high‐temperature maximum has disappeared in the [emim]CH 3 COO–glycerol mixture, and this fact confirms our assumption. Copyright © 2017 John Wiley & Sons, Ltd.