Crystal structure of (E)-2-(4-chlorobenzylidene)-3,4-dihydronaphthalen-1(2H)-one: a second monoclinic polymorph

The title compound, C17H13C10, is the second monoclinic polymorph to crystallize in the space group P2(1)/c. The first polymorph crystallized with two independent molecules in the asymmetric unit [Bolognesi et al. (1975). Acta Cryst. A31, S119; Z' = 2; no atomic coordinates available], whereas the title compound has Z' = 1. In the title polymorph, the dihedral angle between the plane of the benzene ring of the tetralone moiety and that of the 4-chlorobenzyl ring is 52.21 (11)degrees. The cyclohex-2-en-l-one ring of the tetralone moiety has a screw boat conformation. In the crystal, molecules are liked by pairs of C-H center dot center dot center dot pi interactions forming inversion dimers. There are no other significant intermolecular interactions present.