Three bis-ortho-diynylarenes (BODA)

Area of Science:

• Crystallography
• Organic Chemistry
• Materials Science

Background:

• Investigating the structural properties of complex organic molecules is crucial for understanding their potential applications.
• The phenylethynyl group is a key functional group in designing novel organic materials with specific electronic and optical properties.

Purpose of the Study:

• To determine the crystal structures and molecular symmetry of three related organic compounds: 3,3',4,4'-tetrakis(phenylethynyl)biphenyl, Bis[3,4-bis(phenylethynyl)phenyl] ether, and 2,2-bis[3,4-bis(phenylethynyl)phenyl]propane.
• To analyze the impact of different core structures (biphenyl, ether, and propane) on the overall molecular geometry and symmetry.

Main Methods:

• Single-crystal X-ray diffraction was employed to obtain detailed structural information.
• Crystallographic data were analyzed to determine atomic positions, bond lengths, bond angles, and molecular symmetry elements.

Main Results:

• 3,3',4,4'-tetrakis(phenylethynyl)biphenyl was found to be approximately planar and reside on a crystallographic inversion center.
• Bis[3,4-bis(phenylethynyl)phenyl] ether molecules were located on twofold symmetry axes.
• 2,2-bis[3,4-bis(phenylethynyl)phenyl]propane exhibited no molecular symmetry.

Conclusions:

• The study successfully elucidated the distinct crystallographic characteristics of the three investigated molecules.
• The presence or absence of molecular symmetry is influenced by the central linking group within these phenylethynyl-substituted aromatic systems.
• These structural findings provide a foundation for further research into the structure-property relationships of related organic compounds.