2-单溴代双噻吩并[3,2- b:2',3'- d ]磷的合成为一系列连接两个原子的高发光度π-共轭低聚物打开了大门。二硫代磷烯单元通过各种芳香族间隔基。发现连接模式的性质对整个系统的光物理性能有重大影响,或者大大改善了新的扩展发色团的摩尔吸收率,或者提供了具有红移发射特征和大量光致发光量子的发光材料。产量。
Iridium(<scp>iii</scp>) complexes with the dithieno[3,2-<i>b</i>:2′,3′-<i>d</i>]phosphole oxide group and their high optical power limiting performances
New cyclometalated iridium(iii) complexes with the dithieno[3,2-b:2′,3′-d]phosphole oxide group can show a higher optical power limiting ability than C60 for a 532 nm laser.
Structure-reactivity studies on hypervalent square-pyramidal dithieno[3,2-<i>b</i>:2′,3′-<i>d</i>]phospholes
作者:Nayanthara Asok、Joshua R. Gaffen、Ekadashi Pradhan、Tao Zeng、Thomas Baumgartner
DOI:10.1039/d1dt00062d
日期:——
pentacoordinate dithieno[3,2-b:2′,3′-d]phosphole compounds were synthesized by [4 + 1] cycloaddition with o-quinones. Counter to the expected trigonal bipyramidal geometry, the luminescent hypervalent dithienophospholes exhibit square pyramidal geometry with inherently Lewis acidic phosphorus center that is stabilized via supramolecular π-stacking interactions in the solidstate and in solution. Due to their Lewis-acid
通过与邻醌的[4 +1]环加成反应,合成了一系列中性五配位双噻吩并[3,2- b:2',3'- d ]磷化合物。与预期的三角双锥体几何形状相反,发光的高价二硫代磷腈显示方形的锥体几何形状,其固有的路易斯酸性磷中心通过固态和溶液中的超分子π堆积相互作用得以稳定。由于其路易斯酸的特性,这些化合物与亲核试剂反应,表明它们在有机转化中作为介体的潜力。因此,新物种呈现出具有吸引力的结构平台,用于设计具有有用反应性的中性P(V)路易斯酸。
A Simple and Effective Method of Determining Lewis Acidity by Using Fluorescence
作者:Joshua R. Gaffen、Jordan N. Bentley、Lucas C. Torres、Carmen Chu、Thomas Baumgartner、Christopher B. Caputo
DOI:10.1016/j.chempr.2019.03.022
日期:2019.6
optical response to the strength of a Lewis acid. In comparison to commonly used methods that employ 31P NMR chemical shifts or quantum-chemical calculations, our method strongly suggests that using fluorescent Lewis acid-base adducts (FLAs) is more reliable. Moreover, our method provides a direct measure of the Lewisacidity of a given solution, independent of the Lewis base, with direct implications to
Structure–property relationships of acylated asymmetric dithienophospholes
作者:Terry J. Gordon、Lisa D. Szabo、Thomas Linder、Curtis P. Berlinguette、Thomas Baumgartner
DOI:10.1016/j.crci.2010.04.023
日期:2010.8
Résumé Friedel-Crafts acylation was found to be an effective way to selectively access mono-functionalized dithienophospholes. Absorption and emission properties of the acylated compounds exhibited high extinction coefficients, relative to unsubstituted dithienophosphole and bathochromic shifts when in the presence of Lewis-acids, e.g., AlCl3 and BF3, effectively demonstrating that the emissive characteristics could be tuned. Subsequent treatment of the asymmetric mono-substituted compounds with N-bromosuccinimide, yielded materials that were later employed in Ni-catalyzed Yamamoto cross-coupling reactions. The resulting cross-coupled material exhibited a substantial increase in its extinction coefficient as well as a further red-shifted absorbance and emission profile, relative to the mono-functionalized phosphole.
Exploring the Lewis Acidity and Reactivity of Neutral Pentacoordinate Dithienophospholes
作者:Nayanthara Asok、Benjamen A. Zondag、Ekadashi Pradhan、Mary Odagwe、Jesse LeBlanc、Joshua C. Walsh、Graham J. Bodwell、Tao Zeng、Thomas Baumgartner
DOI:10.1002/chem.202300173
日期:——
The square pyramidal geometry in neutral pentavalent dithienophosphole-based Lewis acids is perturbed to distorted trigonal bipyramidal by implementing bulky substituents. With improved accessibility to the P center, these compounds are capable of mediating hydroboration of the catechol proceeding through umpolung of a hydride to a protonic species.
通过实施庞大的取代基,中性五价二噻吩并膦基路易斯酸中的方锥体几何结构被扰乱为扭曲的三角双锥体。通过提高对 P 中心的可及性,这些化合物能够通过将氢化物 umpolung 到质子物质来介导儿茶酚的硼氢化反应。