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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 MULLENS, Jules Hinz-Hubner, D Meyer, G |
Issue Date: | 2003 | Publisher: | TAYLOR & FRANCIS LTD | Source: | 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 | Document URI: | http://hdl.handle.net/1942/2473 | ISSN: | 0267-8292 | e-ISSN: | 1366-5855 | DOI: | 10.1080/0267829031000075442 | ISI #: | 000181726900004 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2004 |
Appears in Collections: | Research publications |
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