Transition Metal Chemistry ( IF 1.6 ) Pub Date : 2021-07-31 , DOI: 10.1007/s11243-021-00473-5 Wei-Wei Zhou 1 , Li Xv 1 , Qing-Hua Zheng 1 , Feng-Wu Wang 1 , Fang-Fang Liu 1 , Li Yue 1 , Yu-Wei Qian 1 , Wang Zhao 1 , Ming-Jun Song 2 , Zhi Xie 3
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Abstract
Two novel 3-D Ln(III)–Cu(I) heterometallic coordination polymers, [Ln2Cu2(L3)4(C2O4)2]·H2O (Ln = Sm, Eu; HL3 = 5-aminonicotinic acid), were hydrothermally produced by reacting lanthanide oxide and copper halide with 5-aminonicotinic acid and orotic acid. In the two isostructural complexes, {Ln6}-wheel clusters link each other via edge-sharing mode, constructing honeycomb-like layers which stack in –ABAB– mode. On the whole, the architectures can be described as sandwich framework constructed by {Ln6}-wheel layers pillared by interlamellar [CuOL32] triangle pillars. The electronic structure was theoretically calculated by the density functional theory, confirming the direct transition character. The steady and transient photoluminescent spectra were measured, from which the intensity parameters, radiative lifetime and quantum efficiency were calculated within the framework of the Judd–Ofelt theory. [Eu2Cu2(L3)4(C2O4)2]·H2O can be regarded as a potential candidate for LED applications.
Graphic Abstract
中文翻译：
由铜簇柱和 {Ln6} 轮层状网络组成的夹心异金属配位聚合物：合成、结构、光谱特性和 Judd-Ofelt 分析
摘要
两种新型 3-D Ln(III)–Cu(I) 异金属配位聚合物，[Ln 2 Cu 2 (L3) 4 (C 2 O 4 ) 2 ]·H 2 O (Ln = Sm, Eu; HL3 = 5-氨基烟酸），是由镧系元素氧化物和卤化铜与 5-氨基烟酸和乳清酸反应而产生的。在两个同构复合体中，{Ln 6 }-轮簇通过边缘共享模式相互连接，构建以-ABAB-模式堆叠的蜂窝状层。总体而言，该架构可描述为由{Ln 6 }-轮层支撑的夹层框架[CuOL3 2] 三角柱。通过密度泛函理论对电子结构进行了理论计算，证实了直接跃迁特性。测量了稳态和瞬态光致发光光谱，并在 Judd-Ofelt 理论的框架内计算了强度参数、辐射寿命和量子效率。[Eu 2 Cu 2 (L3) 4 (C 2 O 4 ) 2 ]·H 2 O可被视为LED应用的潜在候选者。
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