Wydział Chemii

Vera I. Tsaryuk

V. F. Zolin

Janina Legendziewicz

Roman Szostak

Jerzy Sokolnicki

2005

Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy

61

185-191

10.1016/j.saa.2004.04.005

Naukowa

Angielski

Artykuł

Vibrational IR, Raman spectra and vibronic sidebands of Eu³⁺ electronic transitions of europium tris-β-diketonates Eu(β)₃·Ph (β-dipyvaloylmethane (DPM), acetylacetone (AA), benzoylacetone (BA), thenoyltrifluoroacetone (TTFA) and other β-diketones; Ph-methyl-, phenyl-, and nitro-derivatives of 1,10-phenanthroline (Phen)) as well as Eu(β)₃·Bpy and Eu(β)₃·D-Bpy (Bpy- and D-Bpy–H- and D-2,2′-bipyridine) were studied. Effect of ligand radical properties on spectra and manifestation of the reciprocal influence of non-equivalent ligands in spectra are discussed. Dependence of the spectra on electronic density distribution in both ligands as well as on the strength of MO and MN bonds at the variation of radicals of one of the ligands, β or Ph, was examined. Shape of vibronic sidebands was analysed. Behaviour of bands in the middle and far regions of IR spectra of the series Eu(β)₃·Phen and Eu(TTFA)₃·Ph was investigated. Increase of the polarising influence of Eu³⁺ ions on Phen and Bpy molecules and strengthening the EuN bonds in TTFA compounds in comparison with DPM compounds were disclosed from the Raman spectra of Eu(β)₃·Phen and Eu(β)₃·Bpy, that is in accordance with properties of β-diketone radicals. Conclusion about weaker EuN bonds in europium β-diketonates with heterocyclic diimines in comparison with corresponding nitrates was derived from the spectra. Spectral data concerning the relative strength of Euligand bonds are in agreement with available X-ray data.

Europium β-diketonates, β-Diketonate IR spectra, β-Diketonate Raman spectra, Eu3+ vibronic spectra

https://doi.org/10.1016/j.saa.2004.04.005

http://www.elsevier.com