13C NMR Relaxation and1H Diffusion (DOSY) Studies of an Acidic Chloroaluminate Melt

1996 ◽  
Vol 100 (12) ◽  
pp. 4724-4728 ◽  
Author(s):  
W. Robert Carper ◽  
Gilbert J. Mains ◽  
Bernard J. Piersma ◽  
Shawn L. Mansfield ◽  
Cynthia K. Larive
Keyword(s):  
13C Nmr ◽  
Nmr Relaxation ◽  
Chloroaluminate Melt

13C NMR Relaxation Rates in the Ionic Liquid 1-Ethyl-3-methylimidazolium Butanesulfonate

2006 ◽  
Vol 110 (3) ◽  
pp. 868-874 ◽  
Author(s):  
Norman E. Heimer ◽  
John S. Wilkes ◽  
Phillip G. Wahlbeck ◽  
W. Robert Carper
Keyword(s):  
Ionic Liquid ◽  
13C Nmr ◽  
Nmr Relaxation ◽  
Relaxation Rates

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 Gadolinium Complexes as Contrast Agent for Cellular NMR Spectroscopy

2020 ◽  
Vol 21 (11) ◽  
pp. 4042 ◽  
Author(s):  
Nat Sakol ◽  
Ayako Egawa ◽  
Toshimichi Fujiwara
Keyword(s):  
Nmr Spectroscopy ◽  
Contrast Agent ◽  
13C Nmr ◽  
Specific Binding ◽  
Nmr Relaxation ◽  
Cell Membrane Permeability ◽  
Resonance Spectroscopy ◽  
E Coli ◽  
Gadolinium Complexes ◽  
Cellular Components

Aqua Gd3+ and Gd-DOTA (gadolinium-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacete) complexes were studied as a contrast agent in cellular NMR (nuclear magnetic resonance) spectroscopy for distinguishing between intracellular and extracellular spaces. The contrast agents for this purpose should provide strong paramagnetic relaxation enhancement and localize in the extracellular space without disturbing biological functions. Cell membrane permeability to Gd complexes was evaluated from the concentrations of gadolinium complexes in the inside and outside of E. coli cells measured by the 1H-NMR relaxation. The site-specific binding of the complexes to E. coli cells was also analyzed by high-resolution solid-state 13C-NMR. The aqua Gd3+ complex did not enhance T1 relaxation in proportion to the amount of added Gd3+. This Gd3+ concentration dependence and the 13C-NMR indicated that its strong cytotoxicity should be due to the binding of the paramagnetic ions to cellular components especially at the lipid membranes. In contrast, Gd-DOTA stayed in the solution states and enhanced relaxation in proportion to the added amount. This agent exhibited strong T1 contrast between the intra- and extracellular spaces by a factor of ten at high concentrations under which the cells were viable over a long experimental time of days. These properties make Gd-DOTA suitable for selectively contrasting the living cellular space in NMR spectroscopy primarily owing to its weak interaction with cellular components.

scholarly journals Spectral density mapping at multiple magnetic fields suitable for 13C NMR relaxation studies

2016 ◽  
Vol 266 ◽  
pp. 23-40 ◽  
Author(s):  
Pavel Kadeřávek ◽  
Vojtěch Zapletal ◽  
Radovan Fiala ◽  
Pavel Srb ◽  
Petr Padrta ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Spectral Density ◽  
13C Nmr ◽  
Nmr Relaxation ◽  
Density Mapping ◽  
Relaxation Studies ◽  
Spectral Density Mapping
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