Anhydrous tris(dibenzoylmethanido)(o-phenanthroline)europium(III), [Eu(DBM)₃(Phen)]

Abstract

Key indicatorsSingle-crystal X-ray study T = 153 K Mean '(C±C) = 0.007 A Ê R factor = 0.050 wR factor = 0.094 Data-to-parameter ratio = 16.7For details of how these key indicators were automatically derived from the article, seeThe hydrated tris(dibenzoylmethanido)(o-phenanthroline)europium(III) complex, [Eu(DBM) 3 (Phen)]ÁxH 2 O, is converted ef®ciently into anhydrous tris(dibenzoylmethanido)(ophenanthroline)europium(III), [Eu(DBM) 3 (Phen)] or [Eu-(C 15 H 11 O 2 ) 3 (C 12 H 8 N 2 )], by heating under vacuum. The title compound has been characterized by FT±IR, 1 H and 13 C NMR spectroscopy, and X-ray diffraction methods. It crystallizes in the triclinic space group P1 with ®ve molecules in the asymmetric unit, without any pseudosymmetry. The trivalent europium ion is eight-coordinate, and the coordination polyhedron can best be described as a slightly distorted square antiprism.

Structures, and luminescence and magnetic properties of Ln(III) complexes bearing dibenzoylmethane ligand (Ln=Eu and Gd)

“…The central Ln(III) ion is coordinated by six oxygen atoms from three DBM ligands and two nitrogen atoms from phen. The bond lengths and bond angles formed by the central Ln atom are comparable to those reported elsewhere [32]. Eight-coordinated polyhedrons most frequently form dodecahedrons or square antiprisms [33].…”

“…These distances were more than 0.10 Å longer than Ln-O in Ln(DBM) 3 H 2 O (Ln = Ho and Yb) [31,32].…”

“…The optical properties of the chromophore to the rare earth ion may be different from those of the free chromophore because the paramagnetic metal ion increases the intersystem crossing of the chelating chromophore, resulting in a reduction of the fluorescence intensity and a subsequent increase in the phosphorescence intensity. Generally the observed luminescence of the Gd(III) complex originates from the chromophore because the first excited 6 P 7/2 state of Gd(III) (32,200 cm -1 ) is higher than the 1 * state of the chromophore [13][14].…”

A multifunctional luminescent europium photostabilizer based on a novel hindered amine ligand and phenanthroline

“…The complexes were characterized by 1 H NMR, 13 C NMR, EA, FTIR, TGA, and UV–visible absorption spectra. Compared to the 1 H NMR and 13 C NMR spectra of MTPS (Supporting Information Figures S1 and S2), some of the peaks of EuMP (Supporting Information Figures S3 and S4) are observed broadened, overlapped, and shifted, indicating that both MTPS and Phen chelate Eu ion successfully . However, it is difficult to determine the exact ratio of the two ligands because of the broadening and overlap of the peaks.…”

Effect of second ligand on the luminescence of Samarium (III) dibenzoylmethane complexes: Syntheses, crystal structures, thermal analysis and luminescence study

“…The average distance of Sm-O and Sm-N bond lengths for 2, 6 and 7 are relatively similar to one another, in agreement with those reported before (table 1). [23][24][25] 3. 27 This observation is due to scission of first ligand (dbm) into smaller fragments which then is followed by the scission of phen or bpy derivatives into smaller fragments.…”