Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Phys Chem Chem Phys. 2010 Apr 7;12(13):3195-202. doi: 10.1039/b920448b. Epub 2010 Feb 10.
We report a new complex Eu(tta)(3).bpt (tta = thenoyltrifluoroacetonate; bpt = 2-(N,N-di-ethylanilin-4-yl)-4,6-bis(pyrazol-1-yl)-1,3,5-triazine) with excellent long-wavelength sensitized luminescent properties, in which four hydrogen atoms replace the methyl groups at the 3,3'- and 5,5'-positions of the pyrazolyl rings in a previously reported complex Eu(tta)(3).dpbt. Upon visible-light excitation (lambda(ex) = 410 nm) at 295 K, the quantum yield (Phi(Ln)(L)) of Eu(3+) luminescence of Eu(tta)(3).bpt is higher by 23% than that of Eu(tta)(3).dpbt. Different from the case of Eu(tta)(3).dpbt, Phi(Ln)(L) of Eu(tta)(3).bpt increases linearly with the decrease in temperature. Because of the different coordination environments around Eu(3+) ion, the fine structure of the hypersensitive (5)D(0)-->(7)F(2) emission band of Eu(tta)(3).bpt is quite different from that of Eu(tta)(3).dpbt, with the strongest emission line locating at 620 nm rather than 613 nm where the strongest emission line of Eu(tta)(3).dpbt appears. The excitation window of Eu(tta)(3).bpt is much broader than that of Eu(tta)(3).dpbt with a red edge extending up to 450 nm in a dilute toluene solution (1.0 x 10(-5) M) and 500 nm in a toluene solution (1.0 x 10(-2) M). Eu(tta)(3).bpt also exhibits excellent two-photon-excitation luminescent properties.
我们报道了一种新的 Eu(tta)(3).bpt（tta = 三氟乙酰丙酮；bpt = 2-(N,N-二乙基苯胺-4-基)-4,6-双(吡唑-1-基)-1,3,5-三嗪）复合物，具有优异的长波长敏化发光性能，其中四个氢原子取代了先前报道的 Eu(tta)(3).dpbt 复合物中吡唑环的 3,3'-和 5,5'-位上的甲基。在 295 K 下，用可见光激发（lambda(ex) = 410 nm）时，Eu(tta)(3).bpt 的 Eu(3+)发光的量子产率（Phi(Ln)(L)）比 Eu(tta)(3).dpbt 高 23%。与 Eu(tta)(3).dpbt 的情况不同，Eu(tta)(3).bpt 的 Phi(Ln)(L)随温度的降低而线性增加。由于 Eu(3+)离子周围的配位环境不同，Eu(tta)(3).bpt 的敏化（5）D(0)-->(7)F(2)发射带的精细结构与 Eu(tta)(3).dpbt 的精细结构有很大的不同，最强发射线位于 620nm 处，而不是 Eu(tta)(3).dpbt 中最强发射线所在的 613nm 处。Eu(tta)(3).bpt 的激发窗口比 Eu(tta)(3).dpbt 宽得多，在稀甲苯溶液（1.0 x 10(-5) M）中，红色边缘扩展至 450nm，在甲苯溶液（1.0 x 10(-2) M）中扩展至 500nm。Eu(tta)(3).bpt 还表现出优异的双光子激发发光性能。
