title: Influence of structural anisotropy on mesogenity of Eu(III) adducts and optical properties of vitrified films formed on their base.
abstract: A new series of europium adducts with the general formula Eu(CPDk3-CnH2n+1)3Phen, where CPDk3-CnH2n+1 denotes β-diketones and Phen is 1,10-phenanthroline, was synthesized. The obtained mesogenic complexes were heated to the temperatures of the isotropic liquid state and then cooled. The complexes having short CH3 and C2H5 substituents crystallized upon cooling, and the complexes with longer substituents from C3H7 to C6H13 underwent a glass transition with the formation of optically transparent amorphous films. Inside the series the complexes with C7H15 and C8H17 substituents exhibited a unusual smectic C mesomorphism for lanthanidomesogens. On the basis of quantum-chemical simulations and the results of small-angle X-ray scattering the dependence between the anisotropy of Eu(III) complexes with various ligand environments and their supramolecular organization was found. The synthesized Eu(III) complexes in the solid state show intense red photoluminescence upon irradiation by ultraviolet light (λmax - 337 nm).
authors.affiliation: Physical and Colloid Chemistry Department, Kazan National Research Technological University , 420015 Kazan, Russia.
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Knyazev
authors.affiliation: Physical and Colloid Chemistry Department, Kazan National Research Technological University , 420015 Kazan, Russia.
authors.forename: Aleksandr S
authors.initials: AS
authors.lastname: Krupin
authors.affiliation: Physical and Colloid Chemistry Department, Kazan National Research Technological University , 420015 Kazan, Russia.
authors.forename: Elena Yu
authors.initials: EY
authors.lastname: Molostova
authors.affiliation: Physical and Colloid Chemistry Department, Kazan National Research Technological University , 420015 Kazan, Russia.
authors.forename: Ksenia A
authors.initials: KA
authors.lastname: Romanova
authors.affiliation: Physical and Colloid Chemistry Department, Kazan National Research Technological University , 420015 Kazan, Russia.|Kazan E. K. Zavoisky Physical-Technical Institute, Russian Academy of Sciences , 420029 Kazan, Russia.
authors.forename: Yuriy G
authors.initials: YG
authors.lastname: Galyametdinov
mesh_terms: D016880:Anisotropy; D056831:Coordination Complexes / Q000737:chemistry* / Q000528:radiation effects*; D005063:Europium / Q000737:chemistry*; D049449:Luminescence; D008958:Models, Molecular; D013237:Stereoisomerism; D044366:Transition Temperature; D014466:Ultraviolet Rays; D058989:Vitrification
chemical_list: D056831:Coordination Complexes; D005063:Europium