Paramagnetic relaxation affects 13C NMR spectra in the presence of unpaired electrons.
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Peer-reviewed literature demonstrates that the presence of paramagnetic species containing unpaired electrons affects 13C nuclear magnetic resonance spectra, specifically altering relaxation rates and inducing shifts.
Natural abundance 13C-NMR study of paramagnetic horse heart ferricytochrome c cyanide complex: assignment of hyperfine shifted heme methyl carbon resonances.
Hyperfine shifted heme methyl carbon resonances of paramagnetic horse heart ferricytochrome c cyanide complex (Cyt-c(CN)) have been observed for the first time in the natural abundance 13C-NMR spectrum and assigned using 1H-13C heteronuclear chemical shift correlated spectroscopy (1H-13C COSY). Individual heme methyl carbon NMR signal assignment permits a direct comparison between the hyperfine shifts of heme methyl carbon and attached methyl proton resonances which provides a useful information on the delocalization mechanism of the unpaired spin from the pi-conjugated system of porphyrin ring into the peripheral methyl side chains.
Published in Biochemical and biophysical research communications (1988)
The thermal properties of organic–inorganic (CH3NH3)2CoBr4 crystals were investigated using differential scanning calorimetry and thermogravimetric analysis. The phase transition and partial decomposition temperatures were observed at 460 K and 572 K. Nuclear magnetic resonance (NMR) chemical shifts depend on the local field at the site of the resonating nucleus. In addition, temperature-dependent spin–lattice relaxation times (T1ρ) were measured using 1H and 13C magic angle spinning NMR to elucidate the paramagnetic interactions of the (CH3NH3)+ cations. The shortening of 1H and 13C T1ρ of th
Abstract The paramagnetic-salt induced 13C spinlattice relaxation rate of solvents methanol and dimethyl sulfoxide was measured for Ni(ClO4)2, NiSO4, and NiBDS (BDS: m-benzenedisulfonate) solutions in 50 wt.% mixture of each of the solvents and water. Relatively small relaxation rates were found for the solutions containing NiSO4. This fact is ascribed to the exclusion of some solvent molecules from the first coordination shell of Ni2+ due to the coordination of SO42− to Ni2+.
In a two-step synthesis starting with Ni(CH[subscript 3]COO)[subscript 2] ·4H[subscript 2]O and salicylaldehyde, students prepare Nethyl and N-isopropyl Ni(II) Schiff base (imine) complexes. After isolation and recrystallization, the products are characterized by room-temperature magnetic susceptibility measurements, FTIR spectroscopy, and [superscript 1]H, [superscript 13]C{[superscript 1]H}, and [superscript 13]C DEPT-135 or [superscript 13]C APT NMR spectroscopy. The results are analyzed by considering the steric requirements of the ethyl and isopropyl groups and the subsequent effect on th
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