title: Synthesis and photophysical studies of tetrazolate-based Eu(III) photoluminescent ternary complexes containing N-heterocyclic phosphine oxides auxiliary co-ligands.
abstract: Two new ternary tetrazolate Eu(III) complexes with phosphine oxide co-ligands Eu(PTO)3 ·(P1/P2) [PTO = 5-(2-pyridyl-1-oxide)tetrazole, P1 = diphenylphosphorylamino-phenylphosphoryl-benzene, P2 = diphenylphosphorylpyridine)-bis-isobutyricphosphoryl] were synthesized and characterized using UV, fluorescence, IR and (1) H NMR spectroscopic techniques. The analytical data prove that the complexes are mononuclear in nature and the central Eu(III) ion is coordinated by three N and three O atoms of tetrazolate, and two O atoms of the corresponding bidentate phosphine oxide ligands. The ancillary ligand increased the photoluminescence efficiency of Eu(PTO)3 ·P1 (complex 3) by twofold compared with our previously reported Eu(PTO)3 complex (complex 1). Copyright © 2015 John Wiley & Sons, Ltd.
authors.affiliation: Institute of Physical Chemistry, Polish Academy of Sciences, 01224, Warsaw, Kasprzaka 44/52, Poland.|Division of Material Physics, Ruder Boskovic Institute, Bijenicka cesta, 54, 10000, Zagreb, Croatia.
authors.forename: Suraj
authors.initials: S
authors.lastname: Mal
authors.affiliation: Institute of Physical Chemistry, Polish Academy of Sciences, 01224, Warsaw, Kasprzaka 44/52, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Pietraszkiewicz
authors.affiliation: Institute of Physical Chemistry, Polish Academy of Sciences, 01224, Warsaw, Kasprzaka 44/52, Poland.
authors.forename: Oksana
authors.initials: O
authors.lastname: Pietraszkiewicz
mesh_terms: D005063:Europium / Q000737:chemistry*; D006571:Heterocyclic Compounds / Q000737:chemistry*; D008024:Ligands; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010720:Phosphines / Q000737:chemistry*; D055668:Photochemical Processes; D013777:Tetrazoles / Q000737:chemistry*
chemical_list: D006571:Heterocyclic Compounds; D008024:Ligands; D049408:Luminescent Agents; D009942:Organometallic Compounds; D010087:Oxides; D010720:Phosphines; D013777:Tetrazoles; D005063:Europium
keywords: europium; lifetime; phosphine oxides; photoluminescence quantum yield; tetrazoles