Photosensitized luminescence of thermostable polynuclear Eu(III) complexes
Photosensitized luminescence of thermostable polynuclear Eu(III) complexes
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DOI：
10.1016/j.jlumin.2004.08.043
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发表时间：
2005-02-01
影响因子：
3.6
通讯作者：
Yanagida, S
中科院分区：
文献类型：
--
作者：
Manseki, K;Hasegawa, Y;Yanagida, S
在甲醇和三乙胺存在下，用稀土硝酸盐与L或L反应合成了四核铕(III)配合物[Eu-4(Mu-O)(L-1)(10)](L-1=2-羟基-4-辛氧基二苯甲酮，1)和[Eu-4(Mu-O)(L-2)(10)](L-2=2-羟基-4-十二氧基二苯甲酮，2)。在380 nm的激发下，这两种Eu(III)配合物在THF-d(8)中分别在579、590、615、653和699 nm附近观察到光敏发射带，而含乙醇分子的单核配合物3的光敏发射几乎被猝灭。1和2的排放效率分别为3.1+/-0.1%和3.9+/-0.1%。差示扫描量热法(DSC)测定表明，1和2的分解点分别为309℃和320℃，与单核Eu(III)配合物3(250℃)相比，它们具有较高的热稳定性。通过引入多核配合物，将强调设计稳定的强发射稀土化合物的新策略。多核配合物应该为光敏发光和热稳定性开辟广泛的分子设计。(C)2004爱思唯尔B.V.保留所有权利。
Tetranuclear europium(III) complexes, [Eu-4(mu-O)(L-1)(10)] (L-1 = 2-hydroxy-4-octyloxybenzophenone,1) and [Eu-4(mu-O)(L-2)(10)] (L-2 = 2-hydroxy-4-dodecyloxybenzophenone,2) were synthesized by the reaction of lanthanide nitrates with L or L, in the presence of triethylamine in methanol. The photosensitized emission bands of the both Eu(III) complexes in THF-d(8) were observed around 579, 590, 615, 653, and 699 nm by the excitation of the ligands at 380 nm, whereas the emission from the mononuclear complex 3 containing ethanol molecules was almost quenched. The emission efficiencies were determined to be 3.1 +/- 0.1% for 1 and 3.9 +/- 0.1% for 2, respectively. The differential scanning calorimetry (DSC) measurements demonstrated that the decomposition points of 1 and 2 were 309 degreesC and 320 degreesC, respectively, indicating high thermostability of these complexes compared to the mononuclear Eu(III) complex 3 (250degreesC). New strategy for designing stable rare earth compounds giving strong emission would be emphasized by introducing polynuclear complexes. Polynuclear complexes should open a wide range of molecular design for photosensitized luminescence and thermal stability. (C) 2004 Elsevier B.V. All rights reserved.