Nuclear magnetic resonance relaxation in complex spin systems. Proton and boron-11 spin-lattice relaxation studies of carboranes and metallocarboranes

1977 ◽  
Vol 99 (4) ◽  
pp. 1036-1042 ◽  
Author(s):  
Richard Weiss ◽  
Russell N. Grimes
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Lattice Relaxation ◽  
Spin Systems ◽  
Spin Lattice Relaxation ◽  
Nuclear Magnetic Resonance Relaxation ◽  
Spin Lattice ◽  
Complex Spin ◽  
Relaxation Studies ◽  
Resonance Relaxation

Structure and stability of vitamin E – lecithin and phytanic acid – lecithin bilayers studied by 13C and 31P nuclear magnetic resonance

1977 ◽  
Vol 55 (2) ◽  
pp. 220-226 ◽  
Author(s):  
Robert J. Cushley ◽  
Bruce J. Forrest
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Vitamin E ◽  
Magnetic Resonance ◽  
Phytanic Acid ◽  
Relative Rate ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Bilayer Structure ◽  
Spin Lattice ◽  
Relaxation Studies

13C spin–lattice relaxation studies on lecithin bilayers indicate a marked destabilization of the bilayer structure by incorporated vitamin E (d,l-α-tocopherol) and phytanic acid, phytanic acid causing the greatest perturbation.Kinetic analysis of paramagnetic praseodymium infusion into the lecithin vesicles containing various phytyl compounds has been performed using 31P nmr. Relative rates of Pr3+ leakage through the mixed lecithin – phytyl compound bilayer compared with pure lecithin (relative rate = 1.00) were: phytol = 7.8, vitamin E = 47.7, and phytanic acid = 2897.

Mercury-199 nuclear magnetic resonance relaxation in some mercury(II) compounds

1982 ◽  
Vol 60 (16) ◽  
pp. 2113-2117 ◽  
Author(s):  
Roderick E. Wasylishen ◽  
Robert E. Lenkinski ◽  
Charles Rodger
Keyword(s):  
Nuclear Magnetic Resonance ◽  
High Field ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Nuclear Magnetic Resonance Relaxation ◽  
Chemical Shielding ◽  
Nmr Studies ◽  
Spin Lattice ◽  
Resonance Relaxation

Mercury-199 spin-lattice relaxation times are reported for several mercury(II) compounds at 5.875 and 9.40 T. From the field dependence of T1, in Hg(CN)2, Hg(CH3)2, and Hg(C6H5)2, 199Hg chemical shielding anisotropies of 3800, 5820, and 5800 ppm are calculated. The errors in these of estimates of Δσ are at least 10%. Some implications of the large Δσ(199Hg) values in high field nmr studies are discussed.

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