DFT NBO NMR Perturbation techniques Probability density function CONSTANTES DE ACOPLAMIENTO CORRECCION FC-SO COUPLING CONSTANTS EFECTO DE ATOMO PESADO FC-SO CORRECTION Fluorine compounds HEAVY ATOM EFFECT RMN Chemical bonds Fermi contact Fermi level Nuclear magnetic resonance spectroscopy chemical binding chemical structure rotation Aromatic compounds Bond contributions Chemical shifts Couplings Cyclohexanes Data acquisition Density functional theory Derivatives Difluorobenzenes Ethane