title: Mesomorphism and Photophysics of Some Metallomesogens Based on Hexasubstituted 2,2':6', 2''-Terpyridines.
abstract: The luminescent and mesomorphic properties of a series of metal complexes based on hexacatenar 2,2':6',2''-terpyridines are investigated using experimental methods and density functional theory (DFT). Two types of ligand are examined, namely 5,5''-di(3,4,5-trialkoxyphenyl)terpyridine with or without a fused cyclopentene ring on each pyridine and their complexes were prepared with the following transition metals: Zn(II) , Co(III) , Rh(III) , Ir(III) , Eu(III) and Dy(III) . The exact geometry of some of these complexes was determined by single X-ray diffraction. All complexes with long alkyl chains were found to be liquid crystalline, which property was induced on complexation. The liquid-crystalline behaviour of the complexes was studied by polarising optical microscopy and small-angle X-ray diffraction. Some of the transition metal complexes (for example, those with Zn(II) and Ir(III) ) are luminescent in solution, the solid state and the mesophase; their photophysical properties were studied both experimentally and using DFT methods (M06-2X and B3LYP).
authors.affiliation: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
authors.forename: N S Saleesh
authors.initials: NS
authors.lastname: Kumar
authors.affiliation: Department of TOS, Institute of Chemical Engineering, Ural Federal University, 19 Mira str., Ekaterinburg, 620002, Russia.
authors.forename: Marsel Z
authors.initials: MZ
authors.lastname: Shafikov
authors.affiliation: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
authors.forename: Adrian C
authors.initials: AC
authors.lastname: Whitwood
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg (UMR 7504), 23 rue du Loess BP 43, 67034, Strasbourg Cedex 2, France.
authors.forename: Bertrand
authors.initials: B
authors.lastname: Donnio
authors.affiliation: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
authors.forename: Peter B
authors.initials: PB
authors.lastname: Karadakov
authors.affiliation: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.|Department of Applied Sciences, Northumbria University, Newcastle-Upon-Tyne, NE1 8ST, UK.
authors.forename: Valery N
authors.initials: VN
authors.lastname: Kozhevnikov
authors.affiliation: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK. duncan.bruce@york.ac.uk.
authors.forename: Duncan W
authors.initials: DW
authors.lastname: Bruce
keywords: emissive materials; liquid crystals; metallomesogens; photophysics; terpyridine