NMR 13 article 13 Hyperconjugative interactions 10 Spin-spin coupling constants 10 Coupling constants 9 Fermi contact 7 Magnetic Resonance Spectroscopy 7 chemical structure 7 nuclear magnetic resonance spectroscopy 7 Nuclear magnetic resonance 6 Probability density function 6 Chemical bonds 5 Couplings 5 Hydrogen bonds 5 Nuclear magnetic resonance spectroscopy 5 Quantum Theory 5 Substituent effects 5 Sulfur compounds 5 Transmission mechanisms 5 chemistry 5 electron 5 quantum theory 5 13C NMR 4 Perturbation techniques 4 Reference Standards 4 chemical binding 4 hydrogen bond 4 standard 4 Atoms 3 Charge transfer 3