Al-Sharji Houda, Ilmi Rashid, Oliveira Willyan F, Al-Saadi Balqees S, Dutra José D L, Abou-Zied Osama K, Raithby Paul R, Khan Muhammad S
Department of Chemistry, Sultan Qaboos University P. O. Box 36, Al Khod 123 Oman
Pople Computational Chemistry Laboratory, Department of Chemistry, UFS 49100-000 São Cristóvão Sergipe Brazil
RSC Adv. 2024 Oct 15;14(44):32573-32582. doi: 10.1039/d4ra06727d. eCollection 2024 Oct 9.
A monochromatic red emitting nonacoordinate organoeuropium complex with the formula [Eu(hfaa)(Ph-TerPyr)] (Eu-1) incorporating hexafluoroacetylacetone (hfaa) primary ligands and a tridentate 4'-phenyl-2,2':6',2''-terpyridine (Ph-TerPyr) ancillary ligand has been synthesized. The complex was characterized by analytical and spectroscopic methods, and its structure was established by single crystal X-ray diffraction (SC-XRD) analysis at low temperature, which explicitly confirms that the coordination sphere is composed of a EuON core. Under the UV excitation, Eu-1 displayed typical red emission in solution with a long-excited state lifetime ( = 1048.06 ± 9.39 μs) with a good photoluminescence quantum yield ( = 41.14%). We have utilized pump-probe ultrafast transient absorption spectroscopy in tandem with the time-dependent density functional theory (TD-DFT) and the Lanthanide Luminescence Software Package (LUMPAC) to explore the intricate photophysical event that occurs in the vicinity of the ligands of Eu-1 sensitized photoluminescence (PL).
合成了一种发射单色红光的九配位有机铕配合物，其化学式为[Eu(hfaa)(Ph-TerPyr)]（Eu-1），包含六氟乙酰丙酮（hfaa）主配体和三齿4'-苯基-2,2':6',2''-三联吡啶（Ph-TerPyr）辅助配体。通过分析和光谱方法对该配合物进行了表征，并通过低温单晶X射线衍射（SC-XRD）分析确定了其结构，明确证实配位球由EuON核组成。在紫外光激发下，Eu-1在溶液中表现出典型的红色发射，具有较长的激发态寿命（ = 1048.06 ± 9.39 μs）和良好的光致发光量子产率（ = 41.14%）。我们利用泵浦-探测超快瞬态吸收光谱技术，结合含时密度泛函理论（TD-DFT）和镧系发光软件包（LUMPAC），探索了Eu-1敏化光致发光（PL）配体附近发生的复杂光物理事件。
