Longitudinal spin-lattice relaxation in aqueous solutions of dysprosium(III) and copper(II) ions as an indicator of complex formation

1968 ◽  
Vol 46 (12) ◽  
pp. 2178-2180
Author(s):  
E. Bock
Keyword(s):  
Complex Formation ◽  
Aqueous Solutions ◽  
Coordination Number ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Experimental Results ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Longitudinal Spin

Spin-lattice relaxation times of aqueous solutions of Dy(III) and Cu(II) in the presence of acetate ions were determined. The experimental results suggest that the coordination number with respect to the acetate ion appears to be 3 and 2 for the Dy(III) and Cu(II) ion respectively.

NH4+ Ion Motions in Some Ammonium Salts

1981 ◽  
Vol 36 (3) ◽  
pp. 205-209 ◽  
Author(s):  
Fevzi Köksal
Keyword(s):  
Hydrogen Bonding ◽  
Low Temperatures ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Experimental Results ◽  
Ammonium Salts ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Unit Cells ◽  
Good Agreement

Spin-lattice relaxation times of protons in polycrystalline (NH4)2SO4, (NH3OH)2SO4, (NH4)2HPO4, NH4VO3, (NH4)2CrO4, (NH4)2C2O4 • H2O and NH4HF2 salts were measured over the temperature range 100-430 K. The double minima in T1 for the first three compounds were attributed to the nonequivalent NH4+ ions in the unit cells. In NH4VO3, the double minima were attributed to the reorientations about two and three fold axes. However only one minimum in T1 was observed for (NH4)2CrO4, (NH4)2C2O4 • H2O and NH4HF2 and the relaxation mechanisms for the first three compounds were attributed to random reorientations of NH4+ ions. The experimental results are in good agreement with the calculated values by using the existing theoretical expressions. The discrepancies between experimental and calculated values for (NH4)2HPO4 and NH4HF2 at low temperatures were attributed to the tightness of the hydrogen bonding at those temperatures

Spin–Lattice Relaxation Times of H2and D2in Aqueous Solutions

1996 ◽  
Vol 119 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Haggai Gilboa ◽  
Bogdan E. Chapman ◽  
Philip W. Kuchel
Keyword(s):  
Aqueous Solutions ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

p, T-Dependence of the Molecular Dynamics in a Hydrophobic Model System: 2,2-Dimethyl-1-propanol/D2O

1993 ◽  
Vol 48 (7) ◽  
pp. 793-798
Author(s):  
M. Has ◽  
H.-D. Lüdemann
Keyword(s):  
Aqueous Solutions ◽  
Heavy Water ◽  
Binary Solution ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Model System ◽  
Phase Region ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Neat Water

Abstract Aqueous solutions of 2,2-dimethyl-1-propanol were studied as a model system for the p, T-dependence of the hydrophobic interaction at pressures up to 200 MPa and between 273 K and 403 K. The liquid/liquid phase separation of this alcohol in light and heavy water is described. As expected for aqueous solutions of hydrophobic substances, the solubility of the alcohol is larger in light than in heavy water.The p, T, c-dependence of the self diffusion coefficients and of the rotatoric mobility, as given by the deuteron spin lattice relaxation times, of the water and alcohol molecules are studied in the one phase region.The translational and the rotational mobility of the water molecules in the binary solution show at low temperatures the anomalous pressure dependence typical for neat water.

Spin-Lattice Relaxation Times of 1H in Aqueous Gadolinium Chloride Solutions

1983 ◽  
Vol 38 (8) ◽  
pp. 947-948
Author(s):  
Doris Köhnlein ◽  
Otto Lutz ◽  
Reiner Ulmer
Keyword(s):  
Aqueous Solutions ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Gadolinium Chloride ◽  
Chloride Solutions ◽  
Spin Lattice

Abstract Spin-lattice relaxation times T1 of protons in aqueous solutions of gadolinium chloride have been measured at 2.11 T for a larger range of concentrations down to 0.035 millimolal. Very small amounts of GdCl3 decrease strongly T1 of the water protons.

13C NMR Investigations on the Stacking of 5′ -AMP with Tryptamine

1977 ◽  
Vol 32 (5-6) ◽  
pp. 315-320 ◽  
Author(s):  
V. Wray ◽  
K. G. Wagner
Keyword(s):  
Particle Size ◽  
Relaxation Time ◽  
Complex Formation ◽  
Ring Current ◽  
Chemical Shifts ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Adenosine Monophosphate ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

Abstract Stacking, Relaxation Time, Tryptamine, 5′-Adenosine Monophosphate Complex formation between 5′-adenosine monophosphate (5′-AMP) and tryptamine was in­ vestigated by measuring 13C chemical shifts and spin-lattice relaxation times. The chemical shift changes observed were attributed to ring current effects originating in the stacking of the two respective aromatic moieties and to puckering changes of the AMP ribose. Differences in the magnitude of the shifts of the aromatic carbons were related to the geometry of the complex and compared with those found for AMP selfassociation. Upon complex formation the relaxation times of especially the tryptamine indole carbons were greatly reduced, this was explained by an in­ crease in the particle size. Small changes found for the AMP carbons in solutions without tryptamine result from AMP selfassociation. Deviations from isotropic motion observed for the non-aromatic moieties are discussed.

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