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 language | English |
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Pages (from-to) | 160-170 |
Number of pages | 11 |
Journal | Journal of Porphyrins and Phthalocyanines |
Volume | 19 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 2015 Jan 1 |
Externally published | Yes |
Keywords
- columnar phase
- liquid crystal
- one-dimensional polymer
- phthalocyanine
ASJC Scopus subject areas
- Chemistry(all)