Crystal structure of the mesogenic alkene monomer, 3-[4-(4′-ethylbiphenyl)]-1-propene

Abstract

The crystal and molecular structures of the mesogenic monomer 3-[4-(4'-ethylbiphenyl)]1-propene, molecular formula CH₃-CH₂-C₆H₄-C₆H₄-CH₂-CH=CH₂, has been determined by X-ray diffraction analysis at 293(2) K. The compound crystallizes in the form of a noncentrosymmetric monoclinic system, space group Pc, with two molecules per cell. The cell parameters are a = 13.90(5)Å, b = 5.75(1)Å, c =9.54(5)Å and β = 116.1(3)°. Refinement leads to R = 0.0554. Both phenyl rings adopt boat conformations and are nearly coplanar. The molecules form a smectic-like layer structure in the crystalline state.