21 April 2016 Luminescence of europium (III) complexes for visualization
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Abstract
With the purpose to develop bright non-toxic luminescent label for theranostic application we have studied complexation of lanthanide dipicolinates (2,6-pyridinedicarboxylates) by sodium alginate and effect of thermal exposure of synthesized micro-capsules on their luminescent properties. Synthesized micro-capsules are stable in acidic medium but dissolve at pH ~ 4 due to transformation of cationic europium dipicolinate complex to anionic. Luminescence studies have shown that emission spectra of europium(III)-alginate complexes (both chloride and dipicolinate) contain two intensive bands characteristic to Eu3+ ion (5D07F1 (590 nm) and 5D07F1 (612 nm)). We have also found that at 160ºC europium(III)- alginate micro-capsules decompose to black, soot-like substance, therefore, their thermal treatment must be performed in closed environment (i.e., sealed ampoules).
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Olga A. Kolontaeva, Mikhail V. Pozharov, Vladimir F. Korolovich, Anastasia R. Khokhlova, Anna N. Kirdyanova, Natalia A. Burmistrova, Tamara V. Zakharova, Irina Yu. Goryacheva, "Luminescence of europium (III) complexes for visualization", Proc. SPIE 9917, Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS), 99171A (21 April 2016); doi: 10.1117/12.2229738; https://doi.org/10.1117/12.2229738
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