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In this paper, we report translational order parameter in two liquid crystalline compounds, namely, p-cyanobenzylidene p-nonyloxyaniline and p-decyloxybenzylidene p-butylaniline at different temperatures in their smectic phase(s). Translational order parameter has been estimated using the recorded X-ray intensity data. The results obtained are compared and discussed.

In the title compound, C12H11Cl3N2O4, the dihedral angle between the aromatic ring and the hydrazine (NH—N=C) grouping is 52.2 (3)°. The butanedioate groups exhibit planar conformations. An intra­molecular N—H⋯O hydrogen bond links the N—H group of the hydrazine to one of the meth­oxy groups of the butane­dioate moiety. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds and π–π inter­actions are also observed [centroid–centroid separation = 3.535 (1) Å].

In the title compound, C18H21N3O2, the dihedral angle between the benzene rings is 68.85 (11)°. In the crystal, the mol­ecules are linked by C—H⋯O and N—H⋯O hydrogen bonds, as well as weak C—H⋯π contacts, forming a three-dimensional supra­molecular architecture.