Novel pH responsive luminescent poly(oxyethylene phosphate) tris(β-diketonate) europium (III) complexes

• Authors: Stanislav Stanimirov , Ivan Petkov
• Languages of publication: EN

Abstracts

EN

The paper reports on the dependence of the absorbance and luminescent intensity from pH of novel poly(oxyethylene phosphate) tris(β-diketonate) europium (III) complexes. The photophysical data obtained allow some preliminary assumptions about the nature of this phenomenon. Increase in luminescent efficiency is a consequence of enhanced efficiency of energy transfer caused by structural changes in complexes after water deprotonation. Remarkable change has been observed in photophysical properties of the polymer complexes by studying the fluorescent emission and excitation spectra and absorption recorded at various pH both in solution and in the solid state. Some of the complexes derivative of the dibenzoylmethane (DBM) show more than hundred times increase in the luminescence after alkalization. The pH value, at which the maximum luminescent efficiency appears, depends on the type of the fourth ligand. The difference between luminescent efficiency of the complexes in alkaline and neutral environment depends on the β-diketonate ligands and on polymer type as well. [...]

Keywords

EN

Eu(III) complexes; DBM; Poly(oxyethylene phosphate); Luminescence; pH; Ammonia

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2008
• Volume: 6
• Issue: 3
• Pages: 429-437

Dates

published

1 - 9 - 2008

online

11 - 8 - 2008

Contributors

author

Stanislav Stanimirov

• Laboratory of Organic Photochemistry, Faculty of Chemistry, University of Sofia, 1164, Sofia, Bulgaria

author

Ivan Petkov

• Laboratory of Organic Photochemistry, Faculty of Chemistry, University of Sofia, 1164, Sofia, Bulgaria

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Identifiers

DOI

10.2478/s11532-008-0035-2