Synthesis, liquid-crystalline properties, and supramolecular nanostructures of dendronized poly(isocyanide)s and their precursors

Yanqing Tian, Kaori Kamata, Hirohisa Yoshida, Tomokazu Iyoda

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

A series of novel dendronized π-conjugated poly(isocyanide)s were synthesized successfully by using a Pd-Pt μ-ethynediyl dinuclear complex ([ClPt{C2H5)3}2C≡CPt-(P(C 2H5)3}2Cl]) as the initiator. The polymerizations of the dendronized monomers follow first-order kinetics, indicating that living polymerization takes place. The obtained polymers exhibit narrow polydispersities in the range of 1.03-1.20. Thermal properties of the poly(isocyanide)s as well as their isocyanide monomers and precursors with formamido (HCONH-) moieties as apexes were investigated by using differential scanning calorimetry (DSC), polarized optical microscopy (POM) and wide-angle X-ray diffraction (WAXD). Both the peripheries and the apex groups of the dendrons affect the formation of supramolecular column and/or cubic phases of the precursors and monomers. The formamido precursor forms a liquid-crystalline phase due to intermolecular hydrogen bonding. The isocyanide monomer lacks this hydrogen-bonding ability and does not display an organized mesophase. All of the rigid poly(isocyanide)s with the monodendrons exhibit columnar liquid-crystalline phases. Interestingly, cylindrical structures of a poly(isocyanide) were directly visualized by using transmission electron microscopy (TEM).

Original languageEnglish (US)
Pages (from-to)584-591
Number of pages8
JournalChemistry - A European Journal
Volume12
Issue number2
DOIs
StatePublished - Dec 23 2005

Keywords

  • Dendrimers
  • Liquid crystals
  • Living polymerization
  • Nanostructures
  • Polymers

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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