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Luminescent properties of europium complexes with bis(diphenylphosphino)alkane dioxides
Pavla Pekarkova1, Zdenek Spichal, Petr Taborsky
1Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, CZ-62500, Brno, Czech Republic.
Abstract:
Eu(NO(3))(3) · 5H(2)O and EuCl(3) · 6H(2)O were allowed to react with bis(diphenylphosphino)alkane dioxides Ph(2)P(O)(CH(2))(n) P(O)Ph(2)(n = 2, 4, 6) to obtain polymeric and binuclear complexes. The prepared compounds were structurally characterized by X-ray diffraction. Luminescence measurements (emission and excitation spectra, quantum yields, lifetimes) were compared with crystallographic data in order to find a relationship between luminescent properties of the Eu(III) complexes and their structures. The Eu(III) polymers, especially [Eu(dpphO(2))(2)Cl(2)](+) Cl(-)}(n), have shown extremely long luminescence lifetimes, up to 3.73 ms, as a result of a highly protecting hydrophobic shield.
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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

