Lyotropic liquid-crystalline behavior of polyisocyanodipeptides
until further notice
SourceJournal of Polymer Science Part A-Polymer Chemistry, 45, 6, (2007), pp. 981-988
Article / Letter to editor
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Physical Organic Chemistry
Physical Organic and Supramolecular Chemistry
Journal of Polymer Science Part A-Polymer Chemistry
SubjectMolecular Materials; Physical Organic Chemistry
Rigid, helical polyisocyanodipeptides derived from alanine (PIAAs) that form lyotropic liquid-crystalline (LC) phases in tetrachloroethane Eire presented. An investigation by optical microscopy between crossed polarizers demonstrated that PIAAs prepared by the polymerization of isocyanodipeptide monomers with an activated tetrakis isocyanide nickel(II) catalyst could form cholesteric LC phases in tetrachloroethane in concentrations between 18 and 30 wt %. Cholesteric LC phases that were formed in solutions of greater than 25 wt % displayed a reversal of the cholesteric helix upon annealing at 50 degrees C. Diastereomeric PIAA mixtures displayed cholesteric LC behavior only when the PIAAs had the same helix screw sense. (c) 2006 Wiley Periodicals, Inc.
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