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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/2473

Title: Mesophase behaviour and thermal stability of octa-alkoxy substituted phthalocyaninatocobalt(II) complexes
Authors: Sleven, J
Cardinaels, T
Binnemans, K
NELIS, Daniel
Hinz-Hubner, D
Meyer, G
Issue Date: 2003
Citation: LIQUID CRYSTALS, 30(2). p. 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.
Notes: Katholieke Univ Leuven, Dept Chem, B-3001 Louvain, Belgium. Limburgs Univ Ctr, IMO, Lab Inorgan & Phys Chem, B-3590 Diepenbeek, Belgium. Univ Cologne, Inst Anorgan Chem, D-50939 Cologne, Germany.Binnemans, K, Katholieke Univ Leuven, Dept Chem, Celestijnenlaan 200F, B-3001 Louvain, Belgium.Koen.Binnemans@chem.kuleuven.ac.be
URI: http://hdl.handle.net/1942/2473
DOI: 10.1080/0267829031000075442
ISI #: 000181726900004
ISSN: 0267-8292
Category: A1
Type: Journal Contribution
Validation: ecoom, 2004
Appears in Collections: Research publications

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