Thermotropic Ruthenium(II)-Containing Metallomesogens Based on Substituted 1,10-Phenanthroline Ligands

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• 作者：Thomas Cardinaels* ; Jan Ramaekers ; Kris Driesen ; Peter Nockemann ; Kristof Van Hecke ; Luc Van Meervelt ; Bart Goderis ; Koen Binnemans
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：March 16, 2009
• 年：2009
• 卷：48
• 期：6
• 页码：2490-2499
• 全文大小：450K
• 年卷期：v.48,no.6(March 16, 2009)
• ISSN：1520-510X

文摘

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.