The First Helical-Chiral Phosphane Ligands: rac-[5]- and rac-[6]-Heliphos
作者:Andreas Terfort、Helmar Görls、Henri Brunner
DOI:10.1055/s-1997-1498
日期:1997.1
The syntheses of two helical, chiral phosphanes in their racemic forms are described. Their helicene backbone was built up using an improved photocyclization approach. The phosphorus functionalities were introduced in the last step. Up to now, separation of the enantiomers of the helicene phosphanes could be achieved analytically but not on a preparative scale.
Carbo[5]helicene <i>versus</i> planar phenanthrene as a scaffold for organic materials in OLEDs: the electroluminescence of anthracene-functionalized emissive materials
作者:Samik Jhulki、Abhaya Kumar Mishra、Tahsin J. Chow、Jarugu Narasimha Moorthy
DOI:10.1039/c7nj02233f
日期:——
Aesthetically enticing helical structures are inextricable systems in biology, and have rapidly begun to pervade several aspects of materials science. The entry of helicenes in electroluminescent materials is very recent. In the present study, we have designed and synthesized two twisted carbo[5]helicenes functionalized with fluorescent phenylanthryl moieties, namely, CHMANT and CHDANT, for their applications
具有美学吸引力的螺旋结构是生物学中不可分割的系统,并且已迅速渗透到材料科学的多个方面。螺旋烯在电致发光材料中的进入是最近的。在本研究中,我们已经设计并合成了两个被荧光苯基蒽基官能化的扭曲碳[5]螺旋酮,即CHMANT和CHDANT,它们在非掺杂OLED器件中用作发蓝色光的材料。其较低的类似物,即,PMANT和PDANT,基于平面菲支架还设计并合成对比螺旋的效果与基于苯基蒽的发光材料开发中的平面核。结果表明,被苯基蒽基官能化的螺旋烯不仅显示出比类似菲更好的荧光性质和热稳定性,而且还用作电致发光器件中的优良发射材料和主体材料。比较结果表明,在开发基于蒽的OLED发光材料时,作为设计元素的螺旋度(carbo [5] helicene)比平面支架(菲)要好得多。亮度(9820 CD米-2)和功率和发光效率(流明3.48 w ^ -1和4.22光盘-1从一个未掺杂的设备获得的)与制造CHDANT 是迄今为止所报道的所有螺旋材料中最高的。
Synthesis of π-Conjugated Chiral Organoborane Macrocycles with Blue to Near-Infrared Emissions and the Diradical Character of Cations
Highly emissive π-conjugated macrocycles with tunable circularly polarized luminescence (CPL) have sparked theoretical and synthetic interests in recent years. Herein, we report a synthetic approach to obtain newchiral organoborane macrocycles (CMC1, CMC2, and CMC3) that are built on the structurally chiral [5]helicenes and highly luminescent triarylborane/amine moieties embedded into the cyclic systems
Kinetic Control in the Synthesis of a Möbius Tris((ethynyl)[5]helicene) Macrocycle Using Alkyne Metathesis
作者:Xing Jiang、Joshua D. Laffoon、Dandan Chen、Salvador Pérez-Estrada、Andrew S. Danis、Joaquín Rodríguez-López、Miguel A. Garcia-Garibay、Jun Zhu、Jeffrey S. Moore
DOI:10.1021/jacs.0c01430
日期:2020.4.8
The synthesis of conjugated Möbius molecules remains elusive since twisted and macrocyclic structures are low entropy species sporting their own synthetic challenges. Here we report the synthesis of a Möbius macrocycle in 84% yield from the alkyne metathesis of 2,13-bispropynyl[5]helicene. MALDI-MS, NMR, and X-ray diffraction indicated a trimeric product of two-fold symmetry with PPM/MMP configurations
Bromine auxiliaries in photosyntheses of [5]helicenes
作者:Longbin Liu、Thomas J. Katz
DOI:10.1016/0040-4039(91)80418-6
日期:1991.11
Bromine substituents on benzene rings direct photocyclizations away from their ortho positions. This principle prevents [5]helicenes from photocyclizing and methoxyls from photoeliminating. It makes possible the photosynthesis of [5]helicene and of a tetramethoxy-derivative of [5]helicene.