Three closely related (2E,2'E)-3,3'-(1,4-phenylene)-bis[1-(methoxyphenyl)prop-2-en-1-ones]: supramolecular assemblies in one dimension mediated by hydrogen bonding and C--H···π interactions.

In the title compounds, (2E,2'E)-3,3'-(1,4-phenylene)bis[1-(2-methoxyphenyl)-prop-2-en-1-one], C26H22O4 (I), (2E,2'E)-3,3'-(1,4-phenylene)bis[1-(3-methoxyphenyl) prop-2-en-1-one], C26H22O4 (II) and (2E,2'E)-3,30-(1,4-phenylene)bis[1-(3,4-dimethoxyphenyl)prop-2-en-1-one], C28H26O6 (III), the asymmetric unit consists of a half-molecule, completed by crystallographic inversion symmetry. The dihedral angles between the central and terminal benzene rings are 56.98 (8), 7.74 (7) and 7.73 (7)° for (I), (II) and (III), respectively. In the crystal of (I), molecules are linked by pairs of C--H···π interactions into chains running parallel to [101]. The packing for (II) and (III), features inversion dimers linked by pairs of C--H···O hydrogen bonds, forming R2²(16) and R2²(14) ring motifs, respectively, as parts of [201] and [101] chains, respectively. [ABSTRACT FROM AUTHOR]