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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A new class of deep-blue emitting Cu(I) compounds - effects of counter ions on the emission behavior
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A new class of deep-blue emitting Cu(I) compounds - effects of counter ions on the emission behavior

机译：一类新型的深蓝色发射Cu（I）化合物-抗衡离子对发射行为的影响

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摘要

Three deep blue emitting Cu(I) compounds, [Cu(PPh3)tpym]PF6, [Cu(PPh3)tpym]BF4, and [Cu(PPh3)tpym] BPh4 (tpym = tris(2-pyridyl)methane, PPh3 = triphenylphosphine) featuring the tripodally coordinating tpym and the monodentate PPh3 ligands were studied with regard to their structural and photophysical properties. The compounds only differ in their respective counter ions which have a strong impact on the emission properties of the powder samples. For example, the emission quantum yield can be significantly increased for the neat material from less than 10% to more than 40% by exchanging BPh4- with PF6-. These effects can be linked to different molecular packings which depend on the counter ion. In agreement with these results, it was found that the emission properties also strongly depend on the surrounding matrix environment which was elucidated by investigating photophysical properties of the compounds as powders, doped into a polymer matrix, and dissolved in a fluid solution, respectively. The observed differences in the emission behavior can be explained by different and pronounced distortions that occur in the excited state. These distortions are also displayed by density functional theory (DFT) calculations.
机译：发出三种深蓝色的Cu（I）化合物[Cu（PPh3）tpym] PF6，[Cu（PPh3）tpym] BF4和[Cu（PPh3）tpym] BPh4（tpym =三（2-吡啶基）甲烷，PPh3 =研究了具有三重配位tpym和单齿PPh3配体的三苯基膦）的结构和光物理性质。这些化合物仅在各自的抗衡离子方面有所不同，这对粉末样品的发射性能有很大影响。例如，通过将BPh4-与PF6-交换，纯材料的发射量子产率可以从不到10％显着提高到40％以上。这些作用可以与取决于抗衡离子的不同分子堆积相关。与这些结果一致，发现发射性质还强烈取决于周围的基质环境，这通过研究化合物分别以粉末，掺杂到聚合物基质中和溶解在流体溶液中的光物理性质来阐明。观察到的发射行为差异可以用在激发态下发生的明显不同的畸变来解释。这些失真也可以通过密度泛函理论（DFT）计算来显示。

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