High Resolution Nuclear Magnetic Resonance Spectroscopy, Volume 1 |
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Page 89
... dipole moment of the molecule . Buckingham ( 55 ) has used a value for R obtained by Onsager ( 56 ) ; the solute molecule is considered to be a sphere of radius r with a point dipole μ at the centre , and the solvent is considered as a ...
... dipole moment of the molecule . Buckingham ( 55 ) has used a value for R obtained by Onsager ( 56 ) ; the solute molecule is considered to be a sphere of radius r with a point dipole μ at the centre , and the solvent is considered as a ...
Page 134
... dipole along the C = O bond . The dipole is probably best located at the charge centroid of the bond , which depends on such properties as ionic character and hybridisation of the bond , and these are not known for C = O bonds in amides ...
... dipole along the C = O bond . The dipole is probably best located at the charge centroid of the bond , which depends on such properties as ionic character and hybridisation of the bond , and these are not known for C = O bonds in amides ...
Page 137
... dipole opposing Ho . The induced magnetic fields at the methyl and methylene hydrogen nuclei are both in the same direc- tion as Ho . When Ho is perpendicular to the C - X bond direction the elec- trons cannot circulate freely , and ...
... dipole opposing Ho . The induced magnetic fields at the methyl and methylene hydrogen nuclei are both in the same direc- tion as Ho . When Ho is perpendicular to the C - X bond direction the elec- trons cannot circulate freely , and ...
Contents
GENERAL THEORY OF NUCLEAR MAGNETIC RESONANCE 10 como 2 2 2 2 2 2 2 3 2 | 10 |
THE ORIGIN OF CHEMICAL SHIFTS AND SPINSPIN COUPLING | 59 |
Effects in paramagnetic materials | 115 |
Copyright | |
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19F resonance ¹H resonance spectrum AA'BB absorption bands acid Amer analysis applied benzene calculated Chem chemical shift chemical shift difference coil compounds coupling constants cycles sec cycles sec-1 decoupling diagonal diamagnetic doublet E₁ effect eigenfunctions eigenvalues electron energy levels exchange fluorine given gives H₁ H₂ Hamiltonian hydrogen atoms hydrogen bonding hydrogen nuclei hydrogen resonance interaction irradiation line width magnetic field magnetic nuclei magnetically equivalent matrix elements Mc sec-1 measured method methyl molecular molecule multiplet non-equivalent nuclear magnetic resonance nuclei observed obtained orbital paramagnetic parameters Phys proton radiofrequency radiofrequency field relative intensities relative signs relaxation resonance frequency rotation sample sec-¹ Section secular equation shielding constant solutions solvent spectra spectrometer spin functions spin system spin-lattice relaxation spin-spin substituted symmetry T₁ T₂ Table temperature tion transition energies values wavefunctions zero