¹³C-H and ¹³C-¹³C NMR Coupling Constants and Hybridzation of C atom

This paper calculated the nature hybridzations of the carbons of a few hydrocarbons with Fenske-Hall method and nature hybrid orbital theory. The linear relationship between the J_C-H and J_C-C of the hydrocarbons and hybridzations of C atoms is reported. J_C-H=697.5P_SCSH²-37.8(Hz), J_C-C=516P_SCSH²-12.9(Hz). The hybridzations of C atoms for methyl halides is a also calculated in this paper. There is a good linear relationship between the J_C-H of the methyl halides and the third power of the efftective nuclear charge of the carbon atoms. J_C-H=683(29+0.35Q_c)³P_SHSC²-39.5Hz. The factors which affects coupling constant are discussed.