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Synthesis and liquid crystal properties of bipyridine-containing aromatic polyamides

✍ Scribed by Sze Chit Yu; Wai Kin Chan

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
552 KB
Volume
18
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

A series of novel aromatic polyamides containing 2,2′‐bipyridine moiety were synthesized by polycondensation of 2,2′‐bipyridine‐5,5′‐dicarboxylic acid (2) with various aromatic diamines in hexamethylphosphoramide (HMPA) containing lithium chloride. The resulting polyamide solutions in 98% sulfuric acid and in HMPA‐LiCl exhibited lyotropic liquid crystal phases. The phase transition behaviors were studied by polarizing microscopy and X‐ray diffraction. The polyamides also formed metal complexes with cis‐dichlorobis(bipyridine)ruthenium dihydrate [cis‐Ru(bpy)~2~Cl~2~ · 2H~2~O] which was supported by changes in electronic spectra.

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