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.

A Molybdenum(VI) Complex of 5-(2-pyridyl-1-oxide)tetrazole: Synthesis, Structure, and Transformation into a MoO3-Based Hybrid Catalyst for the Epoxidation of Bio-Olefins

“…This oxidant selectively targets the pyridyl N atom, unlike others such as H 2 O 2 and CH 3 CO 3 H, which form inseparable mixtures of products. The interaction between Hpto and bases originates the anion 5-(2-pyridyl-1-oxide)tetrazolate (pto − ) [26][27][28][29]. To the best of our knowledge, the metallo-organic complexes reported in the literature involve the ligand Hpto as an anion, with lanthanide ions Eu(III) [27,28], Gd(III) [26][27][28], and Tb(III) [27] for luminescence purposes, and transition metal ions Zn(II) [26] and Mn(II) [29].…”

“…The interaction between Hpto and bases originates the anion 5-(2-pyridyl-1-oxide)tetrazolate (pto − ) [26][27][28][29]. To the best of our knowledge, the metallo-organic complexes reported in the literature involve the ligand Hpto as an anion, with lanthanide ions Eu(III) [27,28], Gd(III) [26][27][28], and Tb(III) [27] for luminescence purposes, and transition metal ions Zn(II) [26] and Mn(II) [29]. These structures share common bidentate coordination of pto − to the metal center, specifically N(py)-O-M and N1(tz)-M (py = pyridyl ring, tz = tetrazolate ring).…”