Systematic studies on side-chain structures of phthalocyaninato-polysiloxanes: Polymerization and self-assembling behaviors

Satoru Yoneda, Tsuneaki Sakurai, Toru Nakayama, Kenichi Kato, Masaki Takata, Shu Seki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A series of dihydroxysilicon phthalocyanines having soluble side chains were synthesized and their bulk-state polymerization capability was investigated. Detailed spectroscopic study of the obtained phthalocyaninato-polysiloxanes revealed that strong electron donating ability and small steric hindrance of the peripheral substituents are the dominant factors to afford high-molecular weight polymers. The polymers show the behaviors of columnar liquid crystal (LC), which is clarified by the presence of clear X-ray diffraction patterns with a hexagonal lattice and birefringent textures in polarized optical microscopy. Because of the siloxane covalent bonds through central silicon atoms, phthalocyaninato-polysiloxanes accommodate one-dimensional phthalocyanine arrays with strong π-electronic couplings, thus exhibiting colmnar LC property even for the derivatives carrying short peripheral chains and leading to the relatively higher density of π-electron systems in the materials. This tendency is different from typical discotic small molecules that require optimum side chain structures for LC formation.

Original languageEnglish
Pages (from-to)160-170
Number of pages11
JournalJournal of Porphyrins and Phthalocyanines
Volume19
Issue number1-3
DOIs
Publication statusPublished - 2015 Jan 1
Externally publishedYes

Keywords

  • columnar phase
  • liquid crystal
  • one-dimensional polymer
  • phthalocyanine

ASJC Scopus subject areas

  • Chemistry(all)

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