Title: Mesophase behaviour and thermal stability of octa-alkoxy substituted phthalocyaninatocobalt(II) complexes
Authors: Sleven, Jurgen
Cardinaels, Thomas
Binnemans, Koen ×
Nelis, Daniƫl
Mullens, Jules
Hinz-Hübner, Dirk
Meyer, Gerd #
Issue Date: 2003
Publisher: Taylor & francis ltd
Series Title: Liquid crystals vol:30 issue:2 pages:143-148
Abstract: Cobalt(II) phthalocyanines substituted with eight alkoxy chains in the peripheral (2, 3, 9, 10, 16, 17, 23, 24) positions were prepared. The alkoxy chain length was varied between n-butyloxy (C4H9O) and n-octadecyloxy (C18H37O). Studies by polarizing optical microscopy and high temperature X-ray diffraction revealed that all the complexes are liquid crystalline and that they exhibit a hexagonal columnar mesophase (Col(h)). Transition enthalpies were determined by differential scanning calorimetry. The clearing point could only be observed for compounds with a chain length longer than C13H27O. Both the melting and clearing points decrease with increasing chain length. The transition temperatures of these discotic metallo-mesogens are higher than those of the corresponding metal-free phthalocyanines, but are comparable with those of the corresponding copper(II) compounds. The thermal decomposition of the compounds was studied by thermogravimetry.
ISSN: 0267-8292
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
Quantum Chemistry and Physical Chemistry Section
× corresponding author
# (joint) last author

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