Three closely related (2E,2′E)-3,3′-(1,4-phenyl-ene)bis-[1-(meth-oxy-phen-yl)prop-2-en-1-ones]: supra-molecular assemblies in one dimension mediated by hydrogen bonding and C—H?π inter-actions

摘要

In the title compounds, (2E,2′E)-3,3′-(1,4-phenyl-ene)bis-[1-(2-meth-oxy-phen-yl)prop-2-en-1-one], C26H22O4 (I), (2E,2′E)-3,3′-(1,4-phenyl-ene)bis-[1-(3-meth-oxy-phen-yl)prop-2-en-1-one], C26H22O4 (II) and (2E,2′E)-3,3′-(1,4-phenyl-ene)bis-[1-(3,4-di-meth-oxy-phen-yl)prop-2-en-1-one], C28H26O6 (III), the asymmetric unit consists of a half-mol-ecule, 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), mol-ecules are linked by pairs of C—H?π inter-actions 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.