共查询到20条相似文献，搜索用时 15 毫秒
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Yuan Lin Guan‐E Wang Chun‐Li Hu Jiang‐He Feng Li‐Na Li Jiang‐Gao Mao 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(38):13524-13527
In response to ever‐increasing application requirements in lighting and displays, a tremendous emphasis is being placed on single‐component white‐light emission. Single‐component inorganic borates doped with rare earth metal ions have shown prominent achievements in white‐light emission. The first environmentally friendly defect‐induced white‐light emitting crystalline inorganic borate, Ba2[Sn(OH)6][B(OH)4]2, has been prepared. Additionally, it is the first borate‐stannate without a Sn?O?B linkage. Notably, Ba2[Sn(OH)6][B(OH)4]2 shows Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of (0.42, 0.38), an ultrahigh color rendering index (CRI) of 94.1, and an appropriate correlated color temperature (CCT) of 3083 K. Such a promising material will provide a new approach in the development of white‐light emitting applications. 相似文献
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Wen‐Xiu Ni Mian Li Ji Zheng Shun‐Ze Zhan Yu‐Min Qiu Seik Weng Ng Dan Li 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2013,125(50):13720-13720
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Ali Ben Saida Aurlien Chardon Arnaud Osi Nikolay Tumanov Johan Wouters Abel I. Adjieufack Benoît Champagne Guillaume Berionni 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(47):17045-17049
Bending the planar trigonal boron center of triphenylborane by connecting its aryl rings with carbon or phosphorus linkers gave access to a series of 9‐boratriptycene derivatives with unprecedented structures and reactivities. NMR spectroscopy and X‐ray diffraction of the Lewis adducts of these non‐planar boron Lewis acids with weak Lewis base revealed particularly strong covalent bond formation. The first Lewis adduct of a trivalent boron compounds with the Tf2N? anion illustrates the unrivaled Lewis acidity of these species. Increasing the pyramidalization of the boron center and using a cationic phosphonium linker resulted in an exceptional enhancement of Lewis acidity. Introduction of a phosphorus and a boron atom at each edge of a triptycene framework, allowed access to new bifunctional Lewis acid‐base 9‐phospha‐10‐boratriptycenes featuring promising reactivity for the activation of carbon‐halogen bonds. 相似文献
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Junwei Wang Nan Wang Gang Wu Suning Wang Xiaoyu Li 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(10):3114-3118
Multicolor emissive and responsive materials are highly attractive owing to their potential applications in various fields, and polymers are preferred for their good processability and high stability. Herein, we report a series of new polymers based on a methacrylate monomer containing a switchable boron chromophore. In spite of their unconjugated nature, interestingly, the homopolymers from this monomer display rare multicolor fluorescence in solution that is highly dependent on the degree of polymerization (DP). With an increasing DP, the local concentration of the chromophore increases, leading to a higher propensity for switching the blue‐emitting tricoordinate boron chromophore to the red‐emitting tetracoordinate one. The homopolymers also display temperature‐ and solvent‐dependent emission color change. Furthermore, pure white‐light emission could be achieved in various solvents by precisely tuning the homopolymer molecular weight, or in films/solid state by copolymerizing the emissive boron monomer with non‐emissive monomers in an appropriate ratio. 相似文献
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Elliot L. Bennett Elliot J. Lawrence Robin J. Blagg Anna S. Mullen Fraser MacMillan Andreas W. Ehlers Daniel J. Scott Joshua S. Sapsford Andrew E. Ashley Gregory G. Wildgoose J. Chris Slootweg 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(25):8450-8454
We herein explore whether tris(aryl)borane Lewis acids are capable of cleaving H2 outside of the usual Lewis acid/base chemistry described by the concept of frustrated Lewis pairs (FLPs). Instead of a Lewis base we use a chemical reductant to generate stable radical anions of two highly hindered boranes: tris(3,5‐dinitromesityl)borane and tris(mesityl)borane. NMR spectroscopic characterization reveals that the corresponding borane radical anions activate (cleave) dihydrogen, whilst EPR spectroscopic characterization, supported by computational analysis, reveals the intermediates along the hydrogen activation pathway. This radical‐based, redox pathway involves the homolytic cleavage of H2, in contrast to conventional models of FLP chemistry, which invoke a heterolytic cleavage pathway. This represents a new mode of chemical reactivity for hydrogen activation by borane Lewis acids. 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(30):8803-8806
The first highly enantioselective reaction of allenylnitriles with imines has been developed. Excellent yields and enantioselectivities were observed for the reaction with various imines using chiral Phebim‐PdII complexes. This process offers a simple and efficient synthetic route for various functionalized α‐vinylidene‐β‐aminonitriles and their derivatives. 相似文献