Karplus Equation

#Chemistry
Wikipedia Article
Gives the coupling constant between two Vicinal hydrogens

$\displaystyle J(\phi)=C\cos(2\phi)+B\cos(\phi)+A$

• $\displaystyle J$ is the coupling constant
• $\displaystyle \phi$ is the angle between two vicinal hydrogens when looking collinearly along the $\displaystyle \ce{C-C}$ bond

Graph