Photoresponsive europium(III) complex based on photochromic reaction.
Photoresponsive europium(III) complex based on photochromic reaction.
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DOI：
10.1021/jp712079n
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
Tetsuya Nakagawa;Y. Hasegawa;T. Kawai
中科院分区：
文献类型：
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作者：
Tetsuya Nakagawa;Y. Hasegawa;T. Kawai
研究了三（六氟乙酰丙酮）双[4，5-双（5-甲基-2-苯基噻唑-4-基）-2-苯基噻唑]铕（Ⅲ）配合物（Eu（hfa）3（THIA）2）的发光性质及其对电偶极跃迁的光诱导控制.相当高的光致变色反应的配体之间的开环和闭环的形式被发现保持甚至在配合物中，可以观察到可逆的颜色变化多次。Eu（hfa）_3（THIA）_2的光环化和环化逆转量子产率分别为37%和3.4%。在Eu（III）配合物中，THIA配体的闭环形式的热稳定性显著提高。开环配体Eu（hfa）_3（THIA）_2-O配合物的（5）D_0-（7）F_2跃迁强度大于闭环配体Eu（hfa）_3（THIA）_2-C配合物的（5）D_0-（7）F_2跃迁强度。Eu（hfa）_3（THIA）_2-O和Eu（hfa）_3（THIA）_2-C的辐射速率常数分别为1.7 × 10 ~（2）和1.5 × 10 ~（2）s ~（-1）。首次证明了Eu（III）配合物的光致变色反应对发光性质的可逆控制。
Luminescence properties and their photoinduced control of the electric dipole transitions of a Eu(III) complex that has photochromic triangle terarylenes ligands, tris(hexafluoroacetylacetonato)bis[4,5-bis(5-methyl-2-phenylthiazol-4-yl)-2-phenylthiazole]europium(III) (Eu(hfa)3(THIA)2), were studied. Fairly high photochromic reactivity of the ligand between the open-ring and closed-ring forms were found to be maintained even in the complex, and reversible color change could be observed many times. The photocyclization and the cycloreversion quantum yields of the Eu(hfa)3(THIA)2 were found to be 37% and 3.4%, respectively. The thermal stability of the closed-ring form of THIA ligand is significantly improved in the Eu(III) complex. The (5)D0-(7)F2 transition intensity of the Eu(III) complex with open-ring form ligands (Eu(hfa)3(THIA)2-O) is larger than that of the Eu(III) complex with closed-ring form ligands (Eu(hfa)3(THIA)2-C). The radiative rate constants of Eu(hfa)3(THIA)2-O and Eu(hfa)3(THIA)2-C are estimated to be 1.7 x 10(2) and 1.5 x 10(2) s(-1), respectively. The reversible control of the emission properties of the Eu(III) complex by the photochromic reactions is demonstrated for the first time.