Bite angle
![The two phosphorus atoms (orange) of dppe have a bite angle of 85.8° on the palladium atom (blue) in [PdCl2(dppe)].](/uploads/202412/24/PdCl2(dppe)-3D-balls0416.png)



The bite angle is a geometric parameter used to classify chelating ligands in coordination chemistry, including organometallic complexes. Although the parameter can be applied generally to any chelating ligand, it is commonly applied to describe diphosphine ligands, which can adopt a wide range of chelate ring sizes.