Dissociation energy of benzene dimer It is known that the benzene dimer has two stable structures, T-shaped ($\ce{C_{2v}}$) or parallel-displaced ($\ce{C_{2h}}$) structure.

Now the question is: does the dissociation energy ($\ce{D_0}$) $$\ce{(C_6H_6)_2 -&gt; C_6H_6 + C_6H_6}$$ depends on the structures?
Or it is independent of the structures?
In fact you have three configurations to consider: t-shaped, parallel-displaced and sandwich. The dissociation energy depends on the configurations of the structures since they may interact differently. As the pi-pi interaction is directional, the different structures of the dimer interact differently.