Thiophene-derivatized pyridine-biscarboxamide as a sensitizer for LnIII luminescence and 1O2 generation
Thiophene-derivatized pyridine-biscarboxamide as a sensitizer for LnIII luminescence and 1O2 generation
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DOI：
10.1016/j.jlumin.2020.117309
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发表时间：
2020-08
影响因子：
3.6
通讯作者：
Katherine R. Johnson;Manuel A. Gracia-Nava;A. Bettencourt-Dias
中科院分区：
文献类型：
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作者：
Katherine R. Johnson;Manuel A. Gracia-Nava;A. Bettencourt-Dias
本文报道了4-噻吩-3-基吡啶-2，6-二甲酰胺（1 Tcbx）与稀土离子（Ln Ⅲ = Gd Ⅲ、Eu Ⅲ、Nd Ⅲ、Er Ⅲ和Yb Ⅲ）的配合物，并研究了它们的物理化学性质。在乙腈中，1 Tcbx可使可见光和近红外发光的LnIII（LnIII= EuIII、YbIII、NdIII和ErIII）离子增敏。稀土元素Eu、Yb、Nd和Er的敏化量子产率分别为：φEu= 25%、φYb= 0.42%、φNd= 0.19%和φEr= 0.01%。这些发光复合物也产生单线态氧（1 O2），其通过其在1270 nm处的磷光来监测。在Nd Ⅲ I配合物中，1 O2的形成被强的4F 3/2→ 4 I13/2跃迁所掩盖。[Gd（1 Tcbx）3]3+的1 O2生成效率（φ 1 O2）为12%。
Lanthanide ion (LnIII= GdIII, EuIII, NdIII, ErIII, and YbIII) complexes of 4-thiophen-3-yl-pyridine-2,6-dicarboxamide (1Tcbx) were isolated and their photophysical properties explored. In acetonitrile, 1Tcbx sensitizes the visible and NIR-emitting LnIII(LnIII= EuIII, YbIII, NdIII, and ErIII) ions. Quantum yields of LnIIIsensitization are φEu= 25%, φYb= 0.42%, φNd= 0.19%, and φEr= 0.01%. These luminescent complexes generate singlet oxygen (1O2) as well, which is monitored through its phosphorescence at 1270 nm. For the NdIIIcomplex, the formation of1O2was masked by the intense4F3/2→4I13/2transition. The efficiency of1O2generation (φ1O2) was quantified for [Gd(1Tcbx)3]3+at 12%.