除了早先报道的二苯基二碲化物 (Ph 2 Te 2 ) 和卤素键供体 1,4-二碘-四氟苯 ( p -DIFTB) 1α的共晶外,其两种新的多晶型(1β和1γ)呈现出罕见的长-范围超分子合成子模块多态性。与较早报道的形式1α中的 I⋯Te 卤素键 (HaB) 相比,它们的主要构建基序是 I⋯π(Ph) HaB。这种多态三元组的晶格能量计算表明从动力学到热力学形式的1α - 1β - 1γ序列。共晶1β与Ph 2 Se 2 ·( p -DIFTB) 共晶完全同构,Ph 2 Te 2分子在1β中的双链再现了纯Ph 2 Se 2的堆积和Ph 2中Ph 2 Se 2链的模式Se 2 · p -DIFTB。1γ形式的Ph 2 Te 2单链仅与1β部分相似,但是这三个多晶型共晶与天然的 Ph 2 Te一起2和Ph 2 Se 2构成了一个相当详细和显着的结构景观。它表明了Ph 2 Te 2和Ph 2 Se
Thermodynamics of Halogen Bonding in Solution: Substituent, Structural, and Solvent Effects
作者:Mohammed G. Sarwar、Bojan Dragisic、Lee J. Salsberg、Christina Gouliaras、Mark S. Taylor
DOI:10.1021/ja9086352
日期:2010.2.10
demonstrating that both substituent constants (sigma) and calculated molecular electrostatic potential surfaces are useful for constructing such relationships. An electrostatic model is, however, limited in its ability to provide correlation with a more comprehensive data set in which both halogen bond donor and acceptor abilities are varied: the ability of computationally derived binding energies to accurately
The N⋯I Intermolecular Interaction as a General Protocol for the Formation of Perfluorocarbon–Hydrocarbon Supramolecular Architectures 1
作者:Paolo Cardillo、Eleonora Corradi、Angelo Lunghi、Stefano Valdo Meille、Maria Teresa Messina、Pierangelo Metrangolo、Giuseppe Resnati
DOI:10.1016/s0040-4020(00)00476-2
日期:2000.7
The formation of infinite1D networks where diiodoperfluorocarbons are halogen bonded to di-nitrogen substituted hydrocarbons is described. The N⋯I non-covalent interaction is specific, directional, and strong enough to effectively overcome the low affinity between perfluorocarbon and hydrocarbon modules and to drive their self-assembly in the solid and liquid phase. Several analytical techniques are
Photocatalytic Decarboxylative Coupling of Aliphatic N‐hydroxyphthalimide Esters with Polyfluoroaryl Nucleophiles
作者:Xiangli Yi、Runze Mao、Lara Lavrencic、Xile Hu
DOI:10.1002/anie.202108465
日期:2021.10.25
of alkylated polyfluoroarenes remains challenging. Here we describe a decarboxylative coupling reaction of N-hydroxyphthalimide esters of aliphatic carboxylicacids with polyfluoroaryl zinc reagents (Zn-ArF) via synergetic photoredox and copper catalysis. This method readily converts primary and secondary alkyl carboxylicacids into the corresponding polyfluoroaryl compounds, which could have a wide
多氟芳烃是医学和材料化学中的一类重要化合物。烷基化多氟芳烃的合成仍然具有挑战性。在这里,我们描述了脂肪族羧酸的 N-羟基邻苯二甲酰亚胺酯与多氟芳基锌试剂 (Zn-Ar F ) 通过协同光氧化还原和铜催化进行的脱羧偶联反应。该方法很容易将伯烷基羧酸和仲烷基羧酸转化为相应的多氟芳基化合物,该化合物可以具有广泛的 F 含量 (2F-5F) 和芳基上可变的 F 取代模式。实现了广泛的范围和良好的官能团相容性,包括在天然产物和药物衍生的底物上。机理研究表明,[Cu-(Ar F ) 2 ]物种可能负责将多氟芳基转移至烷基自由基。
Radical Cyclization of Arenesulfonyl Chlorides and Alkynes: A Rapid Access to π-Conjugated Benzothiophenes
作者:Danyang Wan、Yudong Yang、Xingyan Liu、Mingliang Li、Siling Zhao、Jingsong You
DOI:10.1002/ejoc.201501439
日期:2016.1
A metal-free radicalcyclization of arenesulfonylchlorides with alkynes has been developed, which provides a rapid and practical access to a variety of π-conjugated benzothiophenes with a broad reactive functional group tolerance. Furthermore, dialkynyl compounds could also undergo this transformation to give extended π-systems in good yields.
Two-Photon Photosensitized Production of Singlet Oxygen: Sensitizers with Phenylene−Ethynylene-Based Chromophores
作者:Sean P. McIlroy、Emiliano Cló、Lars Nikolajsen、Peter K. Frederiksen、Christian B. Nielsen、Kurt V. Mikkelsen、Kurt V. Gothelf、Peter R. Ogilby
DOI:10.1021/jo0482099
日期:2005.2.1
Singlet molecular oxygen (a1Δg) has been produced and optically monitored in time-resolved experiments upon nonlinear two-photon excitation of photosensitizers that contain triple bonds as an integral part of the chromophore. Both experiments and ab initio computations indicate that the photophysical properties of alkyne-containing sensitizers are similar to those in the alkene-containing analogues