One-bond 31 P– 1 H coupling constants depend on the oxidation state of phosphorus: for P III
compounds phosphorus–hydrogen coupling constants ( 1 J PH ) are typically between 100 and
200 Hz, while for P V compounds, 1 J PH are typically between 400 and 1100 Hz. For both
oxidation states, 2 J PH are usually between 5 and 30 Hz, and 3 J PH are between 5 and 10 Hz，
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一键耦合200-700
One-bond 31 P– 1 H coupling constants depend on the oxidation state of phosphorus: for P III
compounds phosphorus–hydrogen coupling constants ( 1 J PH ) are typically between 100 and
200 Hz, while for P V compounds, 1 J PH are typically between 400 and 1100 Hz. For both
oxidation states, 2 J PH are usually between 5 and 30 Hz, and 3 J PH are between 5 and 10 Hz，
当然是书上写的。应当注意2J和3J他写的是通常范围，偶尔有些特例不在这个范围也是正常的