Thermal behaviour of lanthanum(III) alkanoates |
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Authors: | Liesbet Jongen Koen Binnemans Dirk Hinz Gerd Meyer |
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Institution: | 1. Katholieke Universiteit Leuven, Department of Chemistry, Celestijnenlaan 200 F, B-3001 Leuven, Belgium;2. Institut für Anorganische Chemie, Universit?t zu K?ln, Greinstrasse 6 D-50939 K?ln, Germany |
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Abstract: | The mesophase behaviour of the lanthanum(III) alkanoates La(CxH2x+1COO)3] (x =3-19) has been investigated by hot-stage polarizing optical microscopy, differential scanning calorimetry and high-temperature X-ray diffraction. Lanthanum(III) butyrate monohydrate shows no mesomorphism, whereas for the remaining short chain homologues (x = 4-9) a highly viscous mesophase M and a smectic A phase were observed. The longer chain lanthanum(III) soaps (x = 10-19) exhibit only a smectic A phase. However, the chain length has a pronounced effect on the transition temperatures. The thermal behaviour of lanthanum(III) alkanoates is compared with that of other lanthanide(III) alkanoates. |
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Keywords: | Liquid crystals thin films infrared |
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