Mal Suraj, Pietraszkiewicz Marek, Pietraszkiewicz Oksana
Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec, Canada.
Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland.
Luminescence. 2018 Mar;33(2):370-375. doi: 10.1002/bio.3423. Epub 2017 Nov 27.
A new class of antenna chromophores so called 'tetrazolates' have not been explored much for lanthanide luminescencent complexes. However, we have already published several articles considering pyridineoxide tetrazolates as sensitizer with lanthanide ions. Although this class of antenna attracted much less attention because of its poor photoluminescence quantum yields (tris-pyridineoxide tetrazolate europium complex = 13% in solution) we tried and successfully achieved to improve the photoluminescence quantum yields for this particular antenna molecule by replacing coordinated water from the inner coordination sphere of europium ion by introducing phosphine oxides as additional chromophore. In the present article the two bis-phosphine oxides attach two molecules of tris-pyridineoxide tetrazolate europium(III) complex which leads to the improvement of the overall molar absorption coefficients as well as photo-physical properties of the complexes. We found more than two-fold increase (31% in solution) in photoluminescence quantum yield with one of the coordinated phosphine oxides comparing with that of tris-pyridineoxide tetrazolate europium(III) complex.
一类名为“四唑化物”的新型天线发色团在镧系发光配合物方面尚未得到充分研究。然而，我们已经发表了几篇文章，探讨了将吡啶氧化物四唑化物作为镧系离子的敏化剂。尽管这类天线由于其较低的光致发光量子产率（三吡啶氧化物四唑化物铕配合物在溶液中的量子产率为13%）而受到的关注较少，但我们尝试并成功地通过引入膦氧化物作为额外的发色团，取代铕离子内配位层中的配位水，提高了这种特定天线分子的光致发光量子产率。在本文中，两种双膦氧化物连接了两个三吡啶氧化物四唑化物铕（III）配合物分子，这导致了配合物的整体摩尔吸收系数以及光物理性质的改善。我们发现，与三吡啶氧化物四唑化物铕（III）配合物相比，其中一种配位膦氧化物的光致发光量子产率提高了两倍多（在溶液中为31%）。
