Abstract
Abstract 13C nuclear magnetic resonance studies of pyridine solutions containing paramagnetic Ni (II), Co(II), Cu(II), or Mn(II) acetylacetonate are made by observing the induced chemical shift, the line width, and the spin-lattice relaxation time due to the paramagnetism of these metals. The origin of the paramagnetic effects on the 13C spectra induced by Ni, Co, or Cu acetylacetonate is mainly the contact interaction, while the 13C spectra of the pyridine–Mn(AA)2 system can not be interpreted by the same interaction. The 13C spectra of quinoline and isoquinoline containing Mn(AA)2 are also studied; the results indicate that the predominant mechanism is the dipole-dipole interaction.
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