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1.
Robert Malmberg Dr. Michael Bachmann Dr. Olivier Blacque Assoc. Prof. Dr. Koushik Venkatesan 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(14):3627-3636
Phosphorescent mono-cyclometalated gold(III) complexes and their possible applications in organic light emitting diodes (OLEDs) can be significantly enhanced with their improved thermal stability by suppressing the reductive elimination of the respective ancillary ligands. A rational tuning of the π-conjugation of the cyclometalating ligand in conjunction with the non-conjugated 5,5′-(1-methylethylidene)bis(3-trifluoromethyl)-1H-pyrazole were used as a strategy to achieve room-temperature phosphorescence emission in a new series of gold(III) complexes. Photophysical studies of the newly synthesised and characterised complexes revealed phosphorescent emission of the complexes at room temperature in solution, thin films when doped in poly(methyl methacrylate) (PMMA) as well as in 2-Me-THF at 77 K. The complexes exhibit highly tuneable emission behaviour with photoluminescent quantum efficiencies up to 22 % and excited state lifetimes in the range of 63–300 μs. Detailed photophysical investigations in combination with DFT and TD-DFT calculations support the conclusion that the emission properties are strongly dictated by both the cyclometalating ligand and the ancillary chelating ligand. Thermogravimetric studies further show that the thermal stability of the AuIII complexes has been drastically enhanced, making these complexes more attractive for OLED applications. 相似文献
2.
以HMFC[(反)-肉桂酰基二茂铁缩(S)-甲基二硫代碳酰腙]与HBFC[(反)-肉桂酰基二茂铁缩(S)-苄基二硫代碳酰腙]两种Schiff碱分别与醋酸镉[Cd(OAc)2?2H2O]、醋酸汞[Hg(OAc)2]反应,合成了6个未见文献报道的配合物Cd(MFC)2?H2O,Cd(MFC)OAc,Cd(BFC)2,Hg(MFC)2,Hg(MFC)OAc,Hg(BFC)2,考察了其物理性质,并利用元素分析、IR,1HNMR及摩尔电导表征了其组成、可能结构,推断了配位过程.结果表明:这两种Schiff碱都是反式双齿配体,经烯硫醇化并失去质子后,以负硫离子与过渡金属离子形成共价键,氮原子与中心金属离子形成配位键. 相似文献
3.
以HMFC[(反)-肉桂酰基二茂铁缩(S)-甲基二硫代碳酰腙]与HBFC[(反)-肉桂酰基二茂铁缩(S)-苄基二硫代碳酰腙]两种Schiff碱分别与醋酸镉[Cd(OAc)2•2H2O]、醋酸汞[Hg(OAc)2]反应, 合成了6个未见文献报道的配合物Cd(MFC)2•H2O, Cd(MFC)•OAc, Cd(BFC)2, Hg(MFC)2, Hg(MFC)•OAc, Hg(BFC)2, 考察了其物理性质, 并利用元素分析、IR, 1H NMR及摩尔电导表征了其组成、可能结构, 推断了配位过程. 结果表明: 这两种Schiff 碱都是反式双齿配体, 经烯硫醇化并失去质子后, 以负硫离子与过渡金属离子形成共价键, 氮原子与中心金属离子形成配位键. 相似文献
4.
Bimetallic Cyclometalated Iridium(III) Diastereomers with Non‐Innocent Bridging Ligands for High‐Efficiency Phosphorescent OLEDs
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Dr. Yonghao Zheng Dr. Andrei S. Batsanov Dr. Mark A. Fox Dr. Hameed A. Al‐Attar Khalid Abdullah Dr. Vygintas Jankus Prof. Martin R. Bryce Prof. Andrew P. Monkman 《Angewandte Chemie (International ed. in English)》2014,53(43):11616-11619
Two phosphorescent dinuclear iridium(III) diastereomers (ΛΔ/ΔΛ) and (ΛΛ/ΔΔ) are readily separated by making use of their different solubilities in hot hexane. The bridging diarylhydrazide ligand plays an important role in the electrochemistry and photophysics of the complexes. Organic light‐emitting devices (OLEDs) that use these complexes as the green‐emissive dopants in solution‐processable single‐active‐layer architectures feature electroluminescence efficiencies that are remarkably high for dinuclear metal complexes, achieving maximum values of 37 cd A?1, 14 lm W?1, and 11 % external quantum efficiency. 相似文献
5.
Johannes Soellner Mario Tenne Dr. Gerhard Wagenblast Prof. Dr. Thomas Strassner 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(29):9914-9918
The synthesis and characterization of eight unprecedented phosphorescent C^C* cyclometalated mesoionic aryl‐1,2,3‐triazolylidene platinum(II) complexes with different β‐diketonate ligands are reported. All compounds proved to be strongly emissive at room temperature in poly(methyl methacrylate) films with an emitter concentration of 2 wt %. The observed photoluminescence properties were strongly dependent on the substitution on the aryl system and the β‐diketonate ligand. Compared to acetylacetonate, the β‐diketonates with aromatic substituents (mesityl and duryl) were found to significantly enhance the quantum yield while simultaneously reducing the emission lifetimes. Characterization was carried out by standard techniques, as well as solid‐state structure determination, which confirmed the binding mode of the carbene ligand. DFT calculations, carried out to predict the emission wavelength with maximum intensity, were in excellent agreement with the (later) obtained experimental data. 相似文献
6.
Jwu-Ting Chen Yu-Sung Yeh Wen-Hwa Tzeng Tsang-Miao Huang Ming-Chu Cheng Geen-Hsiang Lee Yu Wang 《中国化学会会志》1991,38(6):573-580
Treatment of trans-Pt(COCOPh)(Cl)(PPh3)2 (1a) with AgBF4in THF led to the formation of a metastatic complex trans-[Pt(COCOPh)(THF)(PPh3)2](BF4) (2) which readily underwent ligand substitution to give a cationic aqua complex trans-[Pt(COCOPh)(OH2)(PPh3)2](BF4) (5a). Complex 5a has been characterized spectroscopically and crystallographically. Analogous reaction of trans-Pt(COCOOMe)(Cl)(PPh3)2 (1b) with Ag(CF3SO3) in dried CH2C12 was found first to yield a methoxyoxalyl triflato complextrans-Pt(COCOOMe)(OTf)(PPh3)2 (6). Attempts to crystallize the triflato product in CH2-cl2hexane under ambient conditions also afforded an aqua complex of the triflate salt f/wu-[Pt(COCOOMe)(OH2)(PPhj)2](CF3SO3) (5b). Complex 5a in a noncoordinating solvent such as CH2C12 or CHCl3 suffered spontaneous decarbonylation to form first cis-[Pt(COPh)(CO)(PPh3)2l(BF4) (3a) then the thermodynamically stable isomer trans-[Pt(COPh)(CO)(PPh3)2](BF4) (3b). Crystallization of complex 3b under ambient conditions resulted in an aqua benzoyl complex trans-[Pt(COPh)(OH2)(PPh3)2](BF4) (7). The replacement of the H2O ligand in complex 7 by CO was done simply by bubbling CO into the solution of 7. The single crystal structures of 5b and 7 have been determined by X-ray diffraction. The distances of the Pt-O bonds in 5a, 5b, and 7 support that the aqua ligand is a weak donor in such cationic aquaorganoplatinum(lI) complexes, in agreement with their lability to the substitution reactions. 相似文献
7.
Meng-Xi Mao Fang-Ling Li Yan Shen Qi-Ming Liu Shuai Xing Xu-Feng Luo Zhen-Long Tu Xue-Jun Wu You-Xuan Zheng 《Molecules (Basel, Switzerland)》2021,26(9)
Phosphorescent iridium(III) complexes have been widely researched for the fabrication of efficient organic light-emitting diodes (OLEDs). In this work, three red Ir(III) complexes named Ir-1, Ir-2, and Ir-3, with Ir-S-C-S four-membered framework rings, were synthesized efficiently at room temperature within 5 min using sulfur-containing ancillary ligands with electron-donating groups of 9,10-dihydro-9,9-dimethylacridine, phenoxazine, and phenothiazine, respectively. Due to the same main ligand of 4-(4-(trifluoromethyl)phenyl)quinazoline, all Ir(III) complexes showed similar photoluminescence emissions at 622, 619, and 622 nm with phosphorescence quantum yields of 35.4%, 50.4%, and 52.8%, respectively. OLEDs employing these complexes as emitters with the structure of ITO (indium tin oxide)/HAT-CN (dipyra-zino[2,3-f,2′,3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile, 5 nm)/TAPC (4,4′-cyclohexylidenebis[N,N-bis-(4-methylphenyl)aniline], 40 nm)/TCTA (4,4″,4″-tris(carbazol-9-yl)triphenylamine, 10 nm)/Ir(III) complex (10 wt%): 2,6DCzPPy (2,6-bis-(3-(carbazol-9-yl)phenyl)pyridine, 10 nm)/TmPyPB (1,3,5-tri(mpyrid-3-yl-phenyl)benzene, 50 nm)/LiF (1 nm)/Al (100 nm) achieved good performance. In particular, the device based on complex Ir-3 with the phenothiazine unit showed the best performance with a maximum brightness of 22,480 cd m−2, a maximum current efficiency of 23.71 cd A−1, and a maximum external quantum efficiency of 18.1%. The research results suggest the Ir(III) complexes with a four-membered ring Ir-S-C-S backbone provide ideas for the rapid preparation of Ir(III) complexes for OLEDs. 相似文献
8.
Hélène Beucher Dr. Sudhir Kumar Dr. Roopender Kumar Dr. Estíbaliz Merino Wei-Hsu Hu Gerrit Stemmler Sergio Cuesta-Galisteo Dr. Jorge A. González Léonard Bezinge Dr. Jakub Jagielski Dr. Chih-Jen Shih Prof. Dr. Cristina Nevado 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(72):17604-17612
Efficient OLED devices have been fabricated using organometallic complexes of platinum group metals. Still, the high material cost and low stability represent central challenges for their application in commercial display technologies. Based on its innate stability, gold(III) complexes are emerging as promising candidates for high-performance OLEDs. Here, a series of alkynyl-, N-heterocyclic carbene (NHC)- and aryl-gold(III) complexes stabilized by a κ3-(N^C^C) template have been prepared and their photophysical properties have been characterized in detail. These compounds exhibit good photoluminescence quantum efficiency (ηPL) of up to 33 %. The PL emission can be tuned from sky-blue to yellowish green colors by variations on both the ancillary ligands as well as on the pincer template. Further, solution-processable OLED devices based on some of these complexes display remarkable emissive properties (ηCE 46.6 cd.A−1 and ηext 14.0 %), thus showcasing the potential of these motifs for the low-cost fabrication of display and illumination technologies. 相似文献
9.
由于过渡金属配合物具有独特的光物理化学性质而被广泛研究. 其中Pt(Ⅱ)配合物发生组装时会因Pt(Ⅱ)-Pt(Ⅱ)之间的距离不同而显示不同的荧光特性, 而主客体相互作用可以影响发光小分子的排列及组装. 为进一步探究主客体相互作用对Pt(Ⅱ)配合物发光性能的影响, 设计合成了不同取代的N^C^N型Pt(Ⅱ)配合物, 研究了大环主体葫芦[10]脲(CB[10])对这类配合物的识别作用及包合物的光谱性质. 核磁共振氢谱和质谱证明CB[10]可与配合物以1∶2的比例结合. 紫外-可见吸收光谱和荧光发射光谱分析表明主客体作用对该类金属配合物光谱性质有较大影响, 所形成的主客体包合物的磷光寿命及量子产率都有不同程度的变化. 研究结果表明, CB[10]可通过包结两个Pt(Ⅱ)配合物分子, 拉近铂原子之间的距离, 增强该类配合物在水相中的Pt(II)…Pt(II)相互作用和π-π相互作用, 实现水相中的长寿命磷光发射. 同时, 主客体作用对这类金属配合物的力致变色性质也有一定的影响. 相似文献
10.
Kellen Chen Cheng‐Han Yang Dr. Yun Chi Prof. Chao‐Shiuan Liu Prof. Chih‐Hao Chang Chung‐Chia Chen Chung‐Chih Wu Prof. Min‐Wen Chung Yi‐Ming Cheng Dr. Gene‐Hsiang Lee Dr. Pi‐Tai Chou Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2010,16(14):4315-4327
Treatment of the metal reagent IrCl3 ? nH2O with two equivalents of 2‐pyridyl pyrazole (N^N)H (3‐tert‐butyl‐5‐(2‐pyridyl) pyrazole, (bppz)H and 3‐trifluoromethyl‐5‐(2‐pyridyl) pyrazole, (fppz)H), afforded the isomeric IrIII metal complexes with a general formula cis‐[Ir(bppz)2Cl2]H ( 2 a ), trans‐[Ir(bppz)2Cl2]H ( 3 a ), cis‐[Ir(fppz)2Cl2]H ( 2 b ), and trans‐[Ir(fppz)2Cl2]H ( 3 b ). Single‐crystal X‐ray diffraction studies on 2 b and 3 a revealed the coexistence of two pyrazolate chelates and two terminal chloride ligands on the coordination sphere. Subsequent reactivity studies confirmed their intermediacy to the preparation of homoleptic mer‐[Ir(bppz)3] ( 1 a ) and mer‐[Ir(fppz)3] ( 1 b ) that showed dual intraligand and ligand‐to‐ligand charge‐transfer phosphorescence at room temperature. To attain bright, room‐temperature phosphorescence further, we then synthesized two isoquinolinyl pyrazolate complexes, mer‐[Ir(bipz)3] ( 4 a ) and mer‐[Ir(fipz)3] ( 4 b ) ((bipz)H=3‐tert‐butyl‐5‐(1‐isoquinolyl) pyrazole and (fipz)H=3‐trifluoromethyl‐5‐(1‐isoquinolyl) pyrazole). Their orange luminescence is mainly attributed to the mixed MLCT/ππ* transition, and the quantum yields were as high as 86 ( 4 a ) and 50 % ( 4 b ) in degassed CH2Cl2 solution at RT. The organic light‐emitting diodes (OLEDs) were then fabricated by using 4 a as a dopant, giving orange luminescence with CIEx,y=0.55, 0.45 (CIEx,y=the 1931 Commission Internationale de L’Eclairage (x,y) coordinates) and peak efficiencies of 14.6 % photon/electron, 34.8 cd A?1, 26.1 lm W?1. The device data were then compared with the previously reported heteroleptic complex [Ir(dfpz)2(bipz)] ( 5 ) ((dfpz)H=1‐(2,4‐difluorophenyl) pyrazole), revealing the possible effect of the bipz chelate and phosphor design on the overall electrophosphorescent performance, which can be understood by the differences in the carrier‐transport properties. 相似文献
11.
Zhao Feng Yuanhui Sun Xiaolong Yang Guijiang Zhou 《Chemical record (New York, N.Y.)》2019,19(8):1710-1728
Color‐tuning for phosphorescent emitters in organic light‐emitting diodes (OLEDs) across the entire visible spectrum is prerequisite to fulfil flexible full‐color displays and white solid‐state lighting. Heteroleptic 2‐phenylpyridine‐type (ppy‐type) Ir(III) and Pt(II) complexes as phosphorescent emitters have been well exploited in the electroluminescence (EL) field due to their outstanding EL performance. Furthermore, the photophysical characters of these heteroleptic Ir(III) and Pt(II) complexes are generally dominated by the nature of cyclometalating ppy‐type ligands. Accordingly, either sophisticated modification or judicious combination of different cyclometalating ppy‐type ligands will provide a wonderful platform to tune their emission color. In this personal account, we put a special emphasis on our contributions to the novel color‐tuning strategies in these heteroleptic ppy‐type Ir(III) and Pt(II) complexes. In addition, afforded by our novel color‐tuning strategies, ambipolar character or enhanced electron injection/transport (EI/ET) features can be furnished to bring high EL performances. 相似文献
12.
A Convenient Approach To Synthesize o‐Carborane‐Functionalized Phosphorescent Iridium(III) Complexes for Endocellular Hypoxia Imaging
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Xiang Li Xiao Tong Prof. Dr. Hong Yan Prof. Dr. Changsheng Lu Prof. Dr. Qiang Zhao Prof. Dr. Wei Huang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(48):17282-17290
The structure–property relationship of carborane‐modified iridium(III) complexes was investigated. Firstly, an efficient approach for the synthesis of o‐carborane‐containing pyridine ligands a – f in high yields was developed by utilizing stable and cheap B10H10(Et4N)2 as the starting material. By using these ligands, iridium(III) complexes I – VII were efficiently prepared. In combination with DFT calculations, the photophysical and electrochemical properties of these complexes were studied. The hydrophilic nido‐o‐carborane‐based iridium(III) complex VII showed the highest phosphorescence efficiency (abs. =0.48) among known water‐soluble homoleptic cyclometalated iridium(III) complexes and long emission lifetime (τ=1.24 μs) in aqueous solution. Both of them are sensitive to O2, and thus endocellular hypoxia imaging of complex VII was realized by time‐resolved luminescence imaging (TRLI). This is the first example of applying TRLI in endocellular oxygen detection with a water‐soluble nido‐carborane functionalized iridium(III) complex. 相似文献
13.
Metal Complexes with Azolate‐Functionalized Multidentate Ligands: Tactical Designs and Optoelectronic Applications
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Dr. Chin‐Wei Lu Dr. Yang Wang Prof. Yun Chi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(50):17892-17908
This review is aimed at updating the recent development on the metal complexes bearing azolate‐containing chelates that have received a growing attention from both the industrial and academic sectors. Particular emphasis is given to the luminescent metal complexes, for which tridentate and multidentate bonding interactions give rise to both higher ligand field strength and better rigidity versus their bidentate counterparts—consequently, this is beneficial to the chemical stability and emission efficiency needed for applications such as organic light‐emitting diodes and bio‐imaging. Their basic designs involve chelates, such as monoanionic 6‐azolyl 2,2′‐bipyridine, dianionic 2,6‐diazolylpyridine, and 2‐azolyl‐6‐phenylpyridine, and the core metal ion spanning from main group elements, such as GaIII and InIII, to the late transition metal ions such as RuII, OsII, IrIII, and PtII and even the lanthanides. Furthermore, the great versatility of these azolate chelates for assembling the robust and emissive metal complexes, provides bright prospect in future optoelectronic investigations. 相似文献
14.
Marcus Schulze Dr. Andreas Steffen Prof. Dr. Frank Würthner 《Angewandte Chemie (International ed. in English)》2015,54(5):1570-1573
The phosphorescence emission of perylene bisimide derivatives has been rarely reported. Two novel ruthenium(II) and iridium(III) complexes of an azabenz‐annulated perylene bisimide (ab‐PBI), [Ru(bpy)2(ab‐PBI)][PF6]2 1 and [Cp*Ir(ab‐PBI)Cl]PF6 2 are now presented that both show NIR phosphorescence between 750–1000 nm in solution at room temperature. For an NIR emitter, the ruthenium complex 1 displays an unusually high quantum yield (Φp) of 11 % with a lifetime (τp) of 4.2 μs, while iridium complex 2 exhibits Φp<1 % and τp=33 μs. 1 and 2 are the first PBI‐metal complexes in which the spin–orbit coupling is strong enough to facilitate not only the Sn→Tn intersystem crossing of the PBI dye, but also the radiative T1→S0 transition, that is, phosphorescence. 相似文献
15.
《化学:亚洲杂志》2017,12(1):145-158
Two classes of cationic palladium(II) acetylide complexes containing pincer‐type ligands, 2,2′:6′,2′′‐terpyridine (terpy) and 2,6‐bis(1‐butylimidazol‐2‐ylidenyl)pyridine (C^N^C), were prepared and structurally characterized. Replacing terpy with the strongly σ‐donating C^N^C ligand with two N‐heterocyclic carbene (NHC) units results in the PdII acetylide complexes displaying phosphorescence at room temperature and stronger intermolecular interactions in the solid state. X‐ray crystal structures of [Pd(terpy)(C≡CPh)]PF6 ( 1 ) and [Pd(C^N^C)(C≡CPh)]PF6 ( 7 ) reveal that the complex cations are arranged in a one‐dimensional stacking structure with pair‐like PdII⋅⋅⋅PdII contacts of 3.349 Å for 1 and 3.292 Å for 7 . Density functional theory (DFT) and time‐dependent density functional theory (TD‐DFT) calculations were used to examine the electronic properties. Comparative studies of the [Pt(L)(C≡CPh)]+ analogs by 1H NMR spectroscopy shed insight on the intermolecular interactions of these PdII acetylide complexes. The strong Pd−Ccarbene bonds render 7 and its derivative sufficiently stable for investigation of photo‐cytotoxicity under cellular conditions. 相似文献
16.
Jindong Ren Marvin Cnudde Dana Brünink Stefan Buss Constantin G. Daniliuc Lacheng Liu Harald Fuchs Cristian A. Strassert Hong‐Ying Gao Nikos L. Doltsinis 《Angewandte Chemie (International ed. in English)》2019,58(43):15396-15400
A series of Pt(II) complexes with tetradentate luminophores has been designed, synthesized, and deposited on coinage metal surfaces with the aim to produce highly planar self‐assembled monolayers. Low‐temperature scanning tunneling microscopy (STM) and density functional theory (DFT) calculations reveal a significant initial nonplanarity for all complexes. A subsequent metal‐catalyzed separation of the nonplanar moiety at the bridging unit via the scission of a C?N bond is observed, leaving behind a largely planar core complex. The activation barrier of this bond scission process is found to depend strongly on the chemical nature of both bridging group and coordination plane, and to increase from Cu(111) through Ag(111) to Au(111). 相似文献
17.
Wei Church Poh Dr. Ho-Leung Au-Yeung Dr. Alan Kwun-Wa Chan Dr. Eugene Yau-Hin Hong Dr. Yat-Hin Cheng Dr. Ming-Yi Leung Dr. Shiu-Lun Lai Dr. Kam-Hung Low Prof. Dr. Vivian Wing-Wah Yam 《化学:亚洲杂志》2021,16(22):3669-3676
A series of heteroleptic cyclometalated platinum(II) complexes, [Pt(C^N)(O^O)], ( 1 – 10 ) with various donors and acceptors has been synthesized and characterized by 1H NMR spectroscopy, elemental analyses, infrared spectroscopy and mass spectrometry. The X-ray structure of 2 has also been determined. The electrochemical and photophysical properties of the platinum(II) complexes were studied. These experimental results have been supported by computational studies. Furthermore, two of the complexes have been employed as the active material in the fabrication of resistive memory devices, exhibiting stable binary memory performance with low operating voltage, high ON/OFF ratio and long retention time. 相似文献
18.
Dirk Schlüter Florian Kleemiss Dr. Malte Fugel Dr. Enno Lork Prof. Dr. Kunihisa Sugimoto PD Dr. Simon Grabowsky Prof. Dr. Jeffrey R. Harmer Dr. Matthias Vogt 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(6):1335-1343
Derivatives of 1,2-dithienylethene (DTE) have superb photochromic properties due to an efficient reversible photocyclization reaction of their hexatriene structure and, thus, have application potential in materials for optoelectronics and (multi-responsive) molecular switches. Transition-metal complexes bearing switchable DTE motifs commonly incorporate their coordination site rather distant from the hexatriene system. In this work the redox active ligand 1,2-bis(2,5-dimethylthiophen-3-yl)ethane-1,2-dione is described, which reacts with [V(TMEDA)2Cl2] to give a rare non-oxido vanadium(IV) species 3(M,M/P,P) . This blue complex has two bidentate en-diolato ligands which chelate the VIV center and give rise to two five-membered metallacycles with the adjacent hexatriene DTE backbone bearing axial chirality. Upon irradiation with UVA light or prolonged heating in solution, the blue compound 3(M,M/P,P) converts into the purple atropisomer 4(para,M/para,P) . Both complexes were isolated and structurally characterized by single-crystal X-ray diffraction analysis (using lab source and synchrotron radiation). The antiparallel configuration (M or P helicity) present in both 3(M,M/P,P) and 4(para,M/para,P) is a prerequisite for (reversible) 6π cyclization reactions. A CW EPR spectroscopic study reveals the metalloradical character for 3(M,M/P,P) and 4(para,M/para,P) and indicates dynamic reversible cyclization of the DTE backbone in complex 3(M,M/P,P) at ambient temperature in solution. 相似文献
19.
Near‐IR Emitting Iridium(III) Complexes with Heteroaromatic β‐Diketonate Ancillary Ligands for Efficient Solution‐Processed OLEDs: Structure–Property Correlations
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Dr. Sagar Kesarkar Dr. Wojciech Mróz Dr. Marta Penconi Dr. Mariacecilia Pasini Dr. Silvia Destri Dr. Marco Cazzaniga Dr. Davide Ceresoli Prof. Patrizia R. Mussini Dr. Clara Baldoli Dr. Umberto Giovanella Dr. Alberto Bossi 《Angewandte Chemie (International ed. in English)》2016,55(8):2714-2718
Three NIR‐emitting neutral IrIII complexes [Ir(iqbt)2(dpm)] ( 1 ), [Ir(iqbt)2(tta)] ( 2 ), and [Ir(iqbt)2(dtdk)] ( 3 ) based on the 1‐(benzo[b]thiophen‐2‐yl)‐isoquinolinate (iqtb) were synthesized and characterized (dpm=2,2,6,6‐tetramethyl‐3,5‐heptanedionate; tta=2‐thienoyltrifluoroacetonate; dtdk=1,3‐di(thiophen‐2‐yl)propane‐1,3‐dionate). The compounds emit between λ=680 and 850 nm with high luminescence quantum yields (up to 16 %). By combining electrochemistry, photophysical measurements, and computational modelling, the relationship between the structure, energy levels, and properties were investigated. NIR‐emitting, solution‐processed phosphorescent organic light‐emitting devices (PHOLEDs) were fabricated using the complexes. The devices show remarkable external quantum efficiencies (above 3 % with 1 ) with negligible efficiency roll‐off values, exceeding the highest reported values for solution‐processible NIR emitters. 相似文献
20.
《中国化学会会志》2017,64(6):574-588
This review is aimed at the current research progression of a unique class of Pt(II ) metal complexes bearing at least one azolate‐containing bidentate chelate. The azole fragment can link to a neutral heteroaromatic entity or another azole and form bidentate chelates, such as monoanionic 3‐pyridyl‐1H ‐pyrazole and derivatives, dianionic 3,3′‐bi‐1H ‐pyrazole, 3,3′‐(1‐methylethylidene)‐bis‐1H ‐pyrazole, and their analogs. These azole‐containing chelates readily react with a variety of Pt(II) reagents to afford the corresponding bis‐bidentate Pt(II) complexes. Most of them were highly emissive in solution, doped polymer matrix, thin film, and even as crystal or powder, due to the high ligand field strength exerted by these chelates and their high propensity in forming the singular square‐planar architecture and intermolecular aggregates with substantially strengthened Pt⋯Pt interaction, according to their structural design. Therefore, they hold bright prospects in academic research and future optoelectronic applications such as organic light‐emitting diodes. 相似文献