4

4′-Dicarboxy-1

6-diphenoxy hesane was synthesized

having a m．P．of 303.0℃

and its hydrogen bending associated complex with equal molar 4

4′-bipyridine exhibited thermally stable supramolecular liquid crystal behavior evidenced by DSC

polarized optical microscopy (POM) and FTIR studies．The DSC transition peak temperatures were 209.5

234.6

246.2℃ in the 2nd heating and 243.2

211.9

173.9℃ in the 1st cooling respectively

and the transition peak temperatures were reproducible during different thermal cycles except a little difference in the first heating．By comparison with the building blocks

the FTIR measurements indicated clearly the formation of strong hydrogen bonding between the carboxyl and pyridyl groups in the complex．The two broad bands at 1883.2 cm-1 and 2441.7 cm-1 were assigned to the stretching vibration of O-H group of the carboxylic acid in the hydrogen-bonded state of carboxyl-pyridyl units．The carbonyl peak of the carboxylic dimer at 1675.1 cm-1 shifted to 1682.9 cm-1 in the spectrum of the complex

and the two peaks 2543.5 cm-1 and 2659.5 cm-1 which were assigned to the Fermi resonance of the cathoxylic dimer disappeared．