Europium complexes: choice of efficient synthetic routes from RM1 thermodynamic quantities as figures of merit
作者:Nathalia B. D. Lima、Anderson I. S. Silva、Vanessa F. C. Santos、Simone M. C. Gonçalves、Alfredo M. Simas
DOI:10.1039/c7ra02019h
日期:——
advance the novel general idea that thermodynamic quantities of chemical reactions from RM1 quantum chemical calculations, regarded as figures of merit, are useful to the chemist studying europium complexes. Faced with several different plausible synthetic pathways for the preparation of a given europium complex, the synthetic chemist can now easily compute the RM1 thermodynamic quantities for all of them
Substantial luminescence enhancement in ternary europium complexes by coordination of different ionic ligands
作者:Anderson I. S. Silva、Vanessa F. C. Santos、Nathalia B. D. Lima、Alfredo M. Simas、Simone M. C. Gonçalves
DOI:10.1039/c6ra20609c
日期:——
We demonstrate in a general and comprehensive manner that a substantial enhancement of luminescence in europium complexes can be achieved by increasing ionic ligand diversity. The measured boosts in quantum efficiency ranged from 100% to 543%.
Synthesis, morphology and optoelectronic properties of tris[(N-ethylcarbazolyl)(3′,5′-hexyloxybenzoyl)methane](phenanthroline)- europium
作者:Matthew R. Robinson、Guillermo C. Bazan、Marie B. O’Regan
DOI:10.1039/b004739m
日期:——
The complex tris[1(N-ethylcarbazolyl)(3â²,5â²-hexyloxybenzoyl)methane](phenanthroline)europium 1 incorporates a phenanthroline ligand for electron transport and
a carbazole fragment in the diketonate ligand for hole transport;
furthermore, the six hexyloxy groups prevent crystallization and allow for
the formation of transparent clear films directly from solution; the
photoluminescence from films of 1 is nearly monochromatic, characteristic
of the europium ion and proceeds with an efficiency of 50(3)%; light
emitting diodes(LEDs) were fabricated using the simplest possible device
architecture comprising an anode (ITO), a layer of 1 and a cathode (Ca); a
second LED configuration with a PVK layer on top of the ITO was also
investigated; the performance of the two types of devices is discussed.
复合物三[1(N-乙基咔唑基)(3â²,5â²-己氧基苯甲酰基)甲烷](菲罗啉)铕1中的菲罗啉配体用于电子传输,而二酮酸配体中的咔唑片段则用于空穴传输;此外,六个己氧基基团可防止结晶,并可直接从溶液中形成透明的薄膜;1 薄膜发出的光致发光几乎是单色的,是铕离子的特征,发光效率为 50(3)%;使用最简单的器件结构制造了发光二极管(LED),该结构包括阳极(ITO)、1 层和阴极(Ca);还研究了在 ITO 上添加 PVK 层的第二种 LED 配置;讨论了这两种器件的性能。
Synthesis and Characterisation of Thiophene‐Functionalised Lanthanoid Diketonate Clusters with Solvent‐Modulated Europium Luminescence
作者:Philip C. Andrews、Glen B. Deacon、William J. Gee、Peter C. Junk、Aron Urbatsch
DOI:10.1002/ejic.201200105
日期:2012.7
yl-1-(thiophen-2-yl)prop-2-en-1-one (Hhtp), with hydrated lanthanoid chloride salts has resulted in the isolation of two tetranuclear clusters, [Ln4(μ3-OH)2(μ-O)-κ2-htp}2(μ-O)2-κ2-htp}2(κ2-htp)6] [Ln = Nd (1), Eu (2)] and an erbium pentanuclear cluster, [Er5(μ3-OH)4(μ4-OH)(μ-O)-κ2-htp}4(κ2-htp)6] (3). The clusters have been characterised by elemental analysis, mass spectrometry, infrared spectroscopy
含噻吩的配体 (Z)-3-羟基-3-苯基-1-(噻吩-2-基)prop-2-en-1-one (Hhtp) 与水合镧系元素氯化物盐的反应产生在两个四核簇的分离中,[Ln4(μ3-OH)2(μ-O)-κ2-htp}2(μ-O)2-κ2-htp}2(κ2-htp)6] [Ln = Nd (1), Eu (2)] 和铒五核簇,[Er5(μ3-OH)4(μ4-OH)(μ-O)-κ2-htp}4(κ2-htp)6] ( 3)。这些簇已通过元素分析、质谱、红外光谱和 X 射线单晶结构测定进行了表征。已经评估了簇 2 的发光特性,并且发现在 25 °C 时主要发生发光猝灭。然而,发现逐渐添加选定的配位溶剂可促进 25 °C 下的发光,在低分析物浓度下显示出线性关系
NMR and luminescence experiments reveal the structure and symmetry adaptation of a europium ionic liquid to solvent polarity
作者:Gerson P. Castro、Lizandra L. L. S. Melo、Fernando Hallwass、Simone M. C. Gonçalves、Alfredo M. Simas
DOI:10.1039/d1dt01050f
日期:——
of the ion pairs. In nonpolar solvents, the detected contact ion pairs, CIPs, indicate that the ions remain in proximity, with the molecular cation, and then perturbing and distorting the coordination polyhedron of the anion complex to a low symmetry configuration, which promotes luminescence. Differently, solvent separated ion pairs occur in polar solvents, indicating that the molecular ions have been