Lanthanide-Induced PMR Chemical Shifts in Triglycerides.

Serotonine-nucleotide interaction studied by PMR. Explanation of the variability in association constants obtained from chemical shifts of different protons.

A study of the association of serotonine with 5'-AMP by PMR spectroscopy is described. The association constants obtained from the chemical shift of non-equivalent protons show considerable variation outside experimental error, a fact which wTas reported by several authors. To support the suppositon that small amounts of complexes of different stoichiometry, — which in general can hardly be det...

19F NMR based pH probes: lanthanide(III) complexes with pH-sensitive chemical shifts.

Experimental measurements and theoretical analysis of magnetic properties, structural dynamics and acid-base equilibria for several lanthanide(III) complexes with tetraazacyclododecane derivatives as 19F NMR chemical shift pH probes are presented; pKa values vary between 6.9 and 7.7, with 18 to 40 ppm chemical shift differences between the acidic and basic forms for Ho(III) complexes possessing...

The Interpretation of Lanthanide-Induced Shifts in 1H Nuclear Magnetic Resonance Spectra

Application of lanthanide induced shifts in proton magnetic resonance spectroscopy of juvenile hormones.

A downfield shift of proton signals up to 9 ppm is induced in the 1H NMR spectra of juvenile hormone I (methyl 3,11-dimethyl-10,11-cis-epoxy-7-ethyl-2-trans, 6-trans-tridecadienoate) and III (methyl 10,11-epoxy-2-trans, 6-trans-farnesoate) by the lanthanide complex Eu(fod)3. A plot of induced shift vs the ratio of [LSR]/[substrate] shows a good linear correlation for the range 0.3--1.0 mole rat...

H Chemical Shifts in NMR