Supramolecular aggregates in fluid phases: Mesomorphic ortho-palladated complexes with substituted crown ethers and their potassium adducts.
Fiche publication
Date publication
mars 2008
Auteurs
Membres identifiés du Cancéropôle Est :
Dr GALLANI Jean-Louis
Tous les auteurs :
Coco S, Cordovilla C, Espinet P, Gallani JL, Guillon D, Donnio B
Lien Pubmed
Résumé
New imines (HL) containing substituted dibenzo-18-crown-6-ethers and their dinuclear ortho-palladated complexes, [Pd(mu-X)L](2) (X(-) = CH(3)COO(-), Cl(-)), have been prepared. The free imine ligands are not liquid crystals, but the palladium complexes, including acetato-bridged derivatives, show liquid-crystal properties. The mesomorphic palladium complexes bear six or eight alkoxy chains. Although a columnar arrangement of these chains might be expected, a smectic arrangement is in fact preferred for half of the metallomesogens prepared, which show a smectic C mesophase. Complexation with potassium produces a significant increase in the mesophase range and stability. Moreover, both the free imines and the corresponding liquid-crystalline ortho-palladated complexes form stable Langmuir films at the air-water interface. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany 2008).
Référence
Eur J Inorg Chem. 2008 Mar;8:1210-8.