Synthesis and Thermal Behaviour of Lanthanide Complexes of 4′-[(Cholesterylox y)Carbonyl]-Benzo-15-Crown-5
来源期刊：JOURNAL OF RARE EARTHS2002年第4期
论文作者：Koen Binnemans Bilgi Gündogan
Key words：rare earths; lanthanide compounds; metallomesogens; liquid crystals; crown ether;
Abstract: Lanthanide complexes of a steroid-substituted benzocrown ether were synthesised . The metal-to-ligand ratio of all the metal complexes is 1∶1. The ligand 4′ -[(cholesteryloxy)carbonyl]-benzo-15-crown-5 is a monotropic liquid cryst al, displaying a cholesteric mesophase. The lanthanide complexes with nitrate co unter-ions form a highly viscous mesophase, decomposing at the clearing point. The transition temperatures change as a function of the lanthanide ion. The corr esponding lanthanide complexes with dodecylsulphate (DOS) counter-ions do not f orm a mesophase. In both cases, the metal complexes have a much lower melting po int than the parent ligand.
Koen Binnemans1，Bilgi Gündogan1
(1.Katholieke Universiteit Leuven, Department of Chemistry, Celest ijnenlaan 200F, B-3001 Leuven, Belgium)
Abstract:Lanthanide complexes of a steroid-substituted benzocrown ether were synthesised . The metal-to-ligand ratio of all the metal complexes is 1∶1. The ligand 4′ -[(cholesteryloxy)carbonyl]-benzo-15-crown-5 is a monotropic liquid cryst al, displaying a cholesteric mesophase. The lanthanide complexes with nitrate co unter-ions form a highly viscous mesophase, decomposing at the clearing point. The transition temperatures change as a function of the lanthanide ion. The corr esponding lanthanide complexes with dodecylsulphate (DOS) counter-ions do not f orm a mesophase. In both cases, the metal complexes have a much lower melting po int than the parent ligand.
Key words:rare earths; lanthanide compounds; metallomesogens; liquid crystals; crown ether;
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