Symmetric bi-pyridyl banana-shaped molecule and its intermolecular hydrogen bonding liquid-crystalline complexes

✍ Scribed by Dan Sui; Qiufei Hou; Jia Chai; Ling Ye; Liyan Zhao; Min Li; Shimei Jiang

• Book ID: 103838303
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 383 KB
• Volume: 891
• Category: Article
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2008.04.005

✦ Synopsis

A new symmetric bi-pyridyl banana-shaped molecule 1,3-phenylene diisonicotinate (PDI) was designed and synthesized. Its molecular structure was confirmed by FTIR, Elemental analysis and 1 H NMR. X-ray crystallographic study reveals that there is an angle of approximate 118°among the centroids of the three rings (pyridyl-phenyl-pyridyl) in each PDI molecule indicating a desired banana shape. In addition, a series of liquid crystal complexes nBA:PDI:nBA induced by intermolecular hydrogen bonding between PDI (proton acceptor) and 4-alkoxybenzoic acids (nBA, proton donor) were synthesized and characterized. The mesomorphism properties and optical textures of the complex of nBA:PDI:nBA were investigated by differential scanning calorimetry, polarizing optical microscope and X-ray diffraction.