Graduate School of Engineering/School of Environmental Science and Engineering , Kochi University of Technology , 185 Miyanokuchi , Tosayamada, Kami, Kochi 782-8502 , Japan.
Division of Chemistry and Materials Science, Graduate School of Engineering , Nagasaki University , Bunkyo-machi , Nagasaki 852-8521 , Japan.
Inorg Chem. 2018 Aug 6;57(15):9055-9066. doi: 10.1021/acs.inorgchem.8b01058. Epub 2018 Jul 11.
Novel heteroleptic arylborane-ruthenium(II) complexes having a series of ancillary ligands L' ([Ru(Bbpy)L']) in CHCN showed low-energy/intense metal-to-ligand charge transfer (MLCT)-type absorption and intense/long-lived emission compared to the reference complexes. The spectroscopic and photophysical properties of [Ru(Bbpy)L'] were shown to be manipulated synthetically by the electron-donating ability of the ancillary ligand(s). The intense and long-lived emission observed for [Ru(Bbpy)L'] in CHCN at 298 K is responsible for the accelerated radiative and decelerated nonradiative decay processes, which are controllable through the electronic structures of the ancillary ligand(s). On the basis of the present systematic study, furthermore, we succeeded in demonstrating the Strickler-Berg-type relation between the molar absorption coefficients of the MLCT bands and the radiative rate constants of the complexes.
新型杂芳基硼-钌（II）配合物具有一系列辅助配体 L'([Ru(Bbpy)L'])，在 CHCN 中表现出低能量/高强度金属-配体电荷转移 (MLCT)型吸收和强烈/长寿命发射，与参考配合物相比。[Ru(Bbpy)L']的光谱和光物理性质通过辅助配体的电子给体能力进行了合成调控。在 298 K 下，[Ru(Bbpy)L']在 CHCN 中观察到强烈且长寿命的发射归因于加速的辐射和减速的非辐射衰减过程，这些过程可以通过辅助配体的电子结构进行控制。此外，基于本系统研究，我们成功地证明了 MLCT 带的摩尔吸收系数与配合物的辐射速率常数之间存在 Strickler-Berg 关系。
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