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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Optimization of aggregation-induced phosphorescence enhancement in mononuclear tricarbonyl rhenium(i) complexes: the influence of steric hindrance and isomerism
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Optimization of aggregation-induced phosphorescence enhancement in mononuclear tricarbonyl rhenium(i) complexes: the influence of steric hindrance and isomerism

机译：单核三羰基铼（I）复合物中聚集诱导的磷光增强的优化：空间障碍和异构的影响

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摘要

In order to improve the remarkable performance of a mononuclear tricarbonyl rhenium(i) complex (ReL1) that exhibits rare aggregation-induced phosphorescence enhancement (AIPE) behavior, two new complexes (ReL3 and ReL4) were prepared and investigated. They incorporate a 2-pyridyl-1,2,4-triazole (pyta) ligand connected to a 2-phenylbenzoxazole (PBO) moiety. Complex ReL3 differs from ReL1 by the presence of a bulky tert-butyl substituent, and ReL4 is an isomer where the PBO group is linked to the pyta ligand by its phenyl group. Theoretical calculations were in congruence with electrochemical and spectroscopic properties in solutions. Both new compounds exhibited strong AIPE and much better solid-state emission efficiency than ReL1, with photoluminescence quantum yields up to 55% for ReL4. Crystallographic data indicate that this increase in emission efficiency is due to optimum packing that prevents quenching. This work shows that minor structural changes may have major effects upon the solid-state spectroscopic properties and it provides a rational basis for accessing AIPE-active strongly emissive rhenium(i) complexes.
机译：为了提高表现出稀有聚集诱导的磷光增强（AIPE）行为的单核三羰基铼（I）复合物（Rel1）的显着性能，制备并研究了两种新的复合物（Rel3和Rel4）。它们包含连接到2-苯基苯并恶唑（PBO）部分的2-吡啶基-1,2,4-三唑（PyTa）配体。通过庞大的叔丁基取代基的存在，复合Rel3与Rel1不同，并且Rel 4是通过其苯基与PyTa配体连接的异构体。在溶液中具有电化学和光谱性能的理论计算。两种新化合物比Rel1表现出强大的AIPE和更好的固态发射效率，用光致发光量子产生高达55％的Rel4。晶体数据表明发射效率的增加是由于防止淬火的最佳包装。该工作表明，次要的结构变化可能对固态光谱性质具有重要影响，并且它为进入AIPE激活的强发光铼（I）配合物提供了合理的基础。

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