引用一篇文献中的原话给你：（文献以邻菲啰啉为例 C–H... π）
The search criteria for the EF（ edge-to-face） motif were:
(1) the angle between the normals to the phenanthroline ligand
planes be allowed to cant 40° either side of perpendicularity,
and (2) there be a contact less than 4 Å between any hydrogen
atom from one ligand and the centroid of the C6 ring of
the adjacent phenanthroline ligand.
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+2/108
