method to achieve better blue phosphorescent iridiumcomplexes by appropriate ligand selection and the introduction of adequate substituents. Homoleptic and heteroleptic iridium(III) tris(phenylimidazolinate) complexes were synthesized, and the effect of the substituents on their nature in the excited state was examined. Density functional theory calculation showed that the imidazolinato complexes have
Phosphorescent cationic iridium complexes with phenyl-imidazole type cyclometalating ligands: A combined experimental and theoretical study on photophysical, electrochemical and electroluminescent properties
作者:Lei He、Zhen Wang、Chunpeng Yang、Lian Duan、Ruiren Tang、Xiangzhi Song、Chunyue Pan
DOI:10.1016/j.dyepig.2016.04.006
日期:2016.8
Phosphorescent cationiciridiumcomplexes with phenyl-imidazole type cyclometalating ligands have been synthesized for the first time and their photophysical, electrochemical properties have been comprehensively investigated. By changing the ancillaryligands, the complexes give orange-red or green-blue light. Compared to 2-phenylpyridine (ppy), the phenyl-imidazole ligands destabilize simultaneously
首次合成了具有苯基咪唑型环金属化配体的磷光阳离子铱配合物,并对其光物理,电化学性质进行了全面研究。通过改变辅助配体,复合物会发出橙红色或绿蓝色的光。与2-苯基吡啶(ppy)相比,苯基-咪唑配体同时使配合物的最高占据分子轨道和最低未占据分子轨道不稳定。它们的发射三重态显示出主要的电荷转移(铱/环金属配体→辅助配体)特性。该配合物已被用于制造固态发光电化学电池(LEC)。橙红色LEC的峰值电流效率高达14.3 cd A -1,是橙红色LEC报告的最高记录之一;绿蓝色LEC的峰值电流效率为6.3 cd A -1。已经表明,苯基-咪唑环金属化配体对于具有可调能级和发射性质的铱基阳离子磷光染料的发明具有希望。
Palladation of diimidazolium salts at the C4 position: access to remarkably electron-rich palladium(ii) centers
作者:Marion Heckenroth、Evelyne Kluser、Antonia Neels、Martin Albrecht
DOI:10.1039/b812405a
日期:——
Palladation of C2-protected diimidazolium salts with Pd(OAc)2 afforded complexes comprising C4-bound N-heterocyclic dicarbene ligands. The reactivity of these complexes towards Lewis acids (AgBF4, AgOAc) and Brønsted acids (H2SO4, H3PO4, HOAc) revealed that abnormal C4 bonding of the carbenes markedly increases the nucleophilicity of the coordinated palladium center as compared to C2 bonding. Despite its formal +2 charge, the palladium center in these complexes is best described as a Lewis base. The abnormal carbene bonding mode induces new reaction patterns such as the formation of a Pd–Ag adduct. Based on metallation studies including the palladation of a dissymmetric diimidazolium salt, a rationale for the selective activation of the C4–H bond in the diimidazolium precursor salts is proposed.
Smooth C(alkyl)–H bond activation in rhodium complexes comprising abnormal carbene ligands
作者:Anneke Krüger、L. Jonas L. Häller、Helge Müller-Bunz、Olha Serada、Antonia Neels、Stuart A. Macgregor、Martin Albrecht
DOI:10.1039/c1dt11116g
日期:——
the intramolecular activation of an alkane-type C–H bond and yields mono- and dimetallic complexes containing a formally monoanionic C,C,C-tridentate dicarbene ligandbound to each rhodium centre. Mechanistic investigation of the Calkyl–H bond activation revealed a significant rate enhancement when the carbeneligands are bound to the rhodium centre via C4 (instantaneous activation) as compared to C2-bound
GLIMMSCHUTZBAND FÜR ELEKTRISCHE HOCHSPANNUNGSMASCHINE
申请人:Siemens Aktiengesellschaft
公开号:EP3389058A1
公开(公告)日:2018-10-17
Die Erfindung betrifft ein Glimmschutzband für eine elektrische Hochspannungsmaschine mit phthalsäureanhydridfreien Epoxidharzen. Das hier erstmals vorgestellte Glimmschutzband ist mit seinen Komponenten, insbesondere der alles verbindenden polymeren Matrix, auch Bandkleber genannt, auf die neuen phthalsäureanhydrid-freien Band-Beschleuniger und VPI-Imprägnierharz-Härter eingestellt. Dazu liegt in der polymeren Matrix zumindest ein Anteil an Polyvinylalkohol vor.