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Ramaekers, J.
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Publications (5/5 displayed)
- 2009Thermotropic Ruthenium(II)-Containing Metallomesogens Based on Substituted 1,10-Phenanthroline Ligandscitations
- 2008Imidazo[4,5-f]-1,10-phenanthrolines: Versatile ligands for the design of metallomesogenscitations
- 2008Rigid tetracatenar liquid crystals derived from 1,10-phenanthrolinecitations
- 2005A propeller-like uranyl metallomesogencitations
- 2005Alkali-metal salts of aromatic carboxylic acids: Liquid crystals without flexible chainscitations
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article
Thermotropic Ruthenium(II)-Containing Metallomesogens Based on Substituted 1,10-Phenanthroline Ligands
Abstract
Imidazo[4,5-f]-1,10-phenanthroline and pyrazino[2,3-f]-1,10-phenanthroline substituted with long alkyl chains are versatile ligands for the design of metallomesogens because of the ease of ligand substitution. Whereas the ligands and the corresponding rhenium(I) complexes were not liquid-crystalline, mesomorphism was observed for the corresponding ionic ruthenium(II) complexes with chloride, hexafluorophosphate, and bistriflimide counterions. The mesophases were identified as smectic A phases by high-temperature small-angle X-ray scattering (SAXS) using synchrotron radiation. The transition temperatures depend on the anion, the highest temperatures being observed for the chloride salts and the lowest for the bistriflimide salts. The ruthenium(II) complexes are examples of luminescent ionic liquid crystals.