9,10-Diphenylanthracene (DPA) permits the inclusion of guest molecules (hexafluorobenzene and 1,4-dioxane) by changing the arrangement of its two-dimensional layers and the size of the cavities formed by these layers in a solid state. In particular, the 1,4-dioxane guest molecules are trapped along the cavities by CH-pi interactions with DPA. Crystal data for hexafluorobenzene inclusion complex in DPA,triclinic, space group P (1) over bar, a=6.118(2), b=7.571(2), c=12.982(4) angstrom, alpha=78.366(4)degrees, beta=85.001(5)degrees, gamma=81.687(5)degrees, U=581.7(3)degrees angstrom(3), Z=2. Crystal data for 1,4-dioxane inclusion complex in DPA, triclinic, space group P (1) over bar, a=5.931(1), b=7.625(1), c=12.103(1) angstrom, alpha=85.404(2)degrees, beta=76.300(2)degrees, gamma=82.909(2)degrees, U=526.96(9) angstrom(3), Z=2.