Average Intermolecular Distances and Dynamics of Ruthenium-Containing Organometallic Ionic Liquids Studied by Nuclear Overhauser Effects between19F and1H Nuclei and NMR Relaxation Rate Measurements

2018 ◽  
Vol 91 (4) ◽  
pp. 571-576
Author(s):  
Chikai Tei ◽  
Daisuke Kuwahara ◽  
Tomomi Higashi ◽  
Tomoyuki Mochida
Keyword(s):  
Ionic Liquids ◽  
Relaxation Rate ◽  
Nmr Relaxation ◽  
Nuclear Overhauser ◽  
Nuclear Overhauser Effects ◽  
Intermolecular Distances

scholarly journals 13C NMR relaxation and reorientation dynamics in imidazolium-based ionic liquids: revising interpretation

2014 ◽  
Vol 16 (22) ◽  
pp. 10480-10484 ◽  
Author(s):  
Vladimir V. Matveev ◽  
Denis A. Markelov ◽  
Ekaterina A. Brui ◽  
Vladimir I. Chizhik ◽  
Petri Ingman ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Relaxation Rate ◽  
13C Nmr ◽  
Nmr Relaxation ◽  
Rate Measurement ◽  
Reorientation Dynamics ◽  
C Nmr

An applicability of 13C NMR relaxation rate measurement to calculation of characteristic times for reorientation of [bmim]+ cations is confirmed.

scholarly journals NMR solution conformation of heparin-derived tetrasaccharide

1996 ◽  
Vol 318 (1) ◽  
pp. 93-102 ◽  
Author(s):  
Dmitri MIKHAILOV ◽  
Kevin H. MAYO ◽  
Ioncho R. VLAHOV ◽  
Toshihiko TOIDA ◽  
Azra PERVIN ◽  
...  
Keyword(s):  
Chair Conformation ◽  
Coupling Constants ◽  
Solution Conformation ◽  
1H And 13C Nmr ◽  
Small Deviations ◽  
J Coupling Constants ◽  
Nuclear Overhauser ◽  
Nuclear Overhauser Effects ◽  
Dynamics Simulations ◽  
Ring Conformations

The solution conformation of the homogeneous, heparin-derived tetrasaccharide ΔUA2S(1 → 4)-α-d-GlcNpS6S(1 → 4)-α-l-IdoAp2S(1 → 4)-α-d-GlcNpS6S (residues A, B, C and D respectively, where IdoA is iduronic acid) has been investigated by using 1H- and 13C-NMR. Ring conformations have been defined by J-coupling constants and inter-proton nuclear Overhauser effects (NOEs), and the orientation of one ring with respect to the other has been defined by inter-ring NOEs. NOE-based conformational modelling has been done by using the iterative relaxation matrix approach (IRMA), restrained molecular dynamics simulations and energy minimization to refine structures and to distinguish between minor structural differences and equilibria between various ring forms. Both glucosamine residues B and D are in the 4C1 chair conformation. The 6-O-sulphate group is oriented in the gauche–trans configuration in the D ring, whereas in the B ring the gauche–gauche rotomer predominates. Uronate (A) and iduronate (C) residues are mostly represented by 1H2 and 2S0 twisted boat forms, respectively, with small deviations in expected coupling constants and NOEs suggesting minor contributions from other A and C ring conformations.

Structure assignment of some 3,4′-diquinolinyl sulfides studied by Nuclear Overhauser Effects, X-ray analysis and reactions with sodium methoxide

2010 ◽  
Vol 109 (10) ◽  
pp. 509-514 ◽  
Author(s):  
Stanislaw Boryczka ◽  
Andrzej Maślankiewicz ◽  
Miroslaw Wyszomirski ◽  
Teresa Borowiak ◽  
Maciej Kubicki
Keyword(s):  
Sodium Methoxide ◽  
X Ray ◽  
Nuclear Overhauser ◽  
Nuclear Overhauser Effects ◽  
Structure Assignment
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