Premium
The Synthesis and Glass‐Forming Properties of Phthalocyanine‐Containing Poly(aryl ether) Dendrimers
Author(s) -
Brewis Matthew,
Clarkson Guy J.,
Helliwell Madeleine,
Holder Andrea M.,
McKeown Neil B.
Publication year - 2000
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20001215)6:24<4630::aid-chem4630>3.0.co;2-f
Subject(s) - dendrimer , phthalocyanine , mesophase , materials science , aryl , ether , glass transition , crystallography , polymer chemistry , composite material , chemistry , liquid crystal , organic chemistry , nanotechnology , polymer , alkyl , optoelectronics
The synthesis, structural characterisation and properties of a number of phthalocyanine‐containing dendrimers are described. Peripheral substitution of phthalocyanine (Pc) with four poly(aryl ether) dendritic wedges (1st, 2nd or 3rd generation) produces materials whose properties are dominated both by the columnar self‐association of the Pc core and by the glass‐forming character of the dendritic substituents. Asymmetric Pcs containing a single poly(aryl ether) dendron display a columnar mesophase, the structure of which can be frozen into an anisotropic glass at room temperature. Placing the dendritic wedges at the axial sites of silicon phthalocyanine prohibits self‐association and gives materials from which can be fabricated robust, isotropic solid solutions of Pc with high glass transition temperatures. A single crystal X‐ray diffraction analysis of one of these compounds illustrates the ability of the axial dendrons to prevent cofacial aggregation in the solid state.