核磁共振波谱的类型随着分子中各个核的化学位移和偶合常数的变化,核磁共振波谱常常出现不同的形状。通常,根据核的化学位移和偶合常数的相对大小,图谱可以分为两类。两个核(或化学位移和偶合常数相同的核组)化学位移的差△v(这里化学位移是用频率单位,即化学位移的绝对值)大于偶合常数J的六倍(即△v/J>6),此 Types of Nuclear Magnetic Resonance Spectroscopy Nuclear magnetic resonance spectroscopy often appears in different shapes as the chemical shifts and coupling constants of individual nuclei in the molecule change. In general, the spectra can be divided into two categories based on the relative sizes of chemical shifts and coupling constants of the nuclei. The difference Δv (where chemical shift is here the frequency unit, ie the absolute value of the chemical shift) of chemical shifts of two nuclei (or nuclei of the same chemical shift and coupling constants) is greater than six times the coupling constant J (ie Δv / J > 6), this