High-pressure studies on fluorine substituted 2,5-di(phenyl)-1,3,4-oxadiazoles

2,5-Bis[2-(2-methoxyethoxy)phenyl]-1,3,4-oxadiazole

In the title compound, C₂₀H₂₂N₂O₅, the central 1,3,4-oxadiazole ring is essentially planar [r.m.s. deviation from the best plane of 0.0011 Å] and makes dihedral angles of 4.10 (3) and 13.32 (4)° with the two benzene rings. In the crystal structure, the packing is stabilized by weak non-classical inter­molecular C—H⋯N hydrogen bonds, which link the mol­ecules into an extended network.

Self-organization of substituted 1,3,4-oxadiazoles in the solid state and at surfaces

Different aspects of the structure formation for a class of molecules containing the diphenyl-1,3,4-oxadiazole fragment are discussed. Starting from the bulk state with the ideal crystal lattice and the derivation of some common packing motifs the formation of liquid-crystalline states are described. This leads to the consideration of structures found in Langmuir-Blodgett films and those obtained by organic molecular beam deposition. These structures may again be compared to those for the bulk crystalline state. Common features as well as characteristic differences due to peculiarities of the individual molecular structures are discussed.