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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Sandwich-Type Complexes of Alkaline-Earth Metal Cations with a Bisstyryl Dye Containing Two Crown Ether Units
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Sandwich-Type Complexes of Alkaline-Earth Metal Cations with a Bisstyryl Dye Containing Two Crown Ether Units

机译：含两个冠醚单元的Bisstyryl染料的碱土金属阳离子夹心型配合物

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摘要

The formation of complexes between a bisstyryl dye containing two benzo-15-crown-5 ether groups, 2, and Mg~(2+), Ca~(2+), Sr~(2+), and Ba~(2+) ions was studied in acetonitrile solution by using a spectrophotometric approach. In contrast to its monostyryl analogue 1, which shows a rather low cation-binding selectivity, the bisstyryl dye 2 selectively binds the Sr~(2+) and Ba~(2+) ions because of formation of intramolecular sandwich complexes. Alkaline-earth metal cations induce substantial blue shifts of the absorption maximum of 1 and 2, particularly in the case of sandwich complex formation. The emission behavior of 1 and 2 and their Ba~(2+) complexes in acetonitrile solution has also been studied. In both cases, complex formation leads to a blue shift of the fluorescence maximum and a decrease in the emission quantum yield. The fluorescence decay is monoexponential for the complex of 1 and biexponential for that of 2. The longer-lived fluorescence component, which corresponds to the lower-energy band in the steady-state spectrum, is assigned to an intramolecular excimer state.
机译：含两个苯并15-冠-5醚基2和Mg〜（2 +），Ca〜（2 +），Sr〜（2+）和Ba〜（2+）的双苯乙烯基染料之间的配合物形成使用分光光度法在乙腈溶液中研究离子。与它的单苯乙烯基类似物1相比，它显示出相当低的阳离子结合选择性，双苯乙烯基染料2由于形成了分子内三明治复合物，因此选择性地结合了Sr〜（2+）和Ba〜（2+）离子。碱土金属阳离子引起吸收最大值1和2发生明显的蓝移，特别是在形成三明治复合物的情况下。还研究了1和2及其Ba〜（2+）配合物在乙腈溶液中的发射行为。在这两种情况下，复合物的形成都会导致荧光最大值发生蓝移并降低发射量子产率。对于1的复合物，荧光衰减是单指数的，对于2的复合物，荧光衰减是双指数的。寿命更长的荧光分量（对应于稳态光谱中的较低能带）被分配为分子内准分子状态。

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