6-(4-Meth­oxy­phen­yl)naphtho[2,3-b][1]benzothio­phene

The asymmetric unit of the title compound, C₂₃H₁₆OS, contains two independent mol­ecules with opposite orientations of the meth­oxy groups bonded to the benzene rings. The napthobenzothiophene group in the two molecules is separated by an average distance of 3.912 Å. In both mol­ecules, the napthobenzothio­phene unit is almost planar, with r.m.s deviations of 0.0522 and 0.0143 Å. The meth­oxy­phenyl ring makes dihedral angles of 67.0 (6)° and 70.4 (6)° with respect to the napthobenzothio­phene ring system in the two mol­ecules. The crystal packing features C—H...S, π–π [centroid–centroid distances = 3.666 (10) and 3.658 (10) Å] and C–H...π inter­actions, forming a sheet running along the b-axis direction.

9-(4-Meth­oxy­phen­yl)anthracene

In the title compound, C₂₁H₁₆O, the dihedral angle between the anthracene ring system and the benzene ring is 74.3 (5)°. The anthracene ring system is essentially planar (r.m.s. deviation = 0.0257 Å) and the meth­oxy group lies in the plane of the benzene ring [C1—O1—C2—C7 torsion angle = 0.5 (2)°]. The crystal structure features π–π [centroid–centroid distance = 3.9487 (12) Å] and C–H...π inter­actions, forming a sheet running along the a-axis direction.