Lithium halide ion-pair recognition with halogen bonding and chalcogen bonding heteroditopic macrocycles
作者:Yuen Cheong Tse、Andrew Docker、Zongyao Zhang、Paul D. Beer
DOI:10.1039/d1cc01287h
日期:——
contrasting halide anion selectivity and binding affinity, with the halogen bonding ditopic host capable of exclusively binding lithium chloride whereas the chalcogen bonding ditopic receptor displays notable selectivity for lithium iodide over lithium bromide. Preliminary solid–liquid extraction experiments demonstrate the potential of sigma–hole mediated ion-pair recognition as a promising strategy
一系列含有异位大环受体的卤素键和硫族元素键合的邻菲咯啉对卤化锂(LiX)离子对具有协同识别作用。CDCl 3 :CD 3中的1 H NMR离子对定量定量滴定实验CN(1:1,v / v)揭示了卤离子与阴离子的结合,尤其是与卤素键合主体系统的共键合锂离子开关。双碘和碲甲基三唑的σ-孔供体基序的使用赋予了卤化物阴离子选择性和结合亲和力相反的特性,其中卤素键合双位主体能够完全结合氯化锂,而硫族元素键合对位受体对碘化锂显示出显着的选择性。溴化锂。初步的固液萃取实验表明,σ孔介导的离子对识别是锂盐回收的一种有前途的策略。
Iterative Synthesis of Oligo[<i>n</i>]rotaxanes in Excellent Yield
作者:James E. M. Lewis、Joby Winn、Luca Cera、Stephen M. Goldup
DOI:10.1021/jacs.6b08958
日期:2016.12.21
We present an operationally simple iterative coupling strategy for the synthesis of oligomeric homo- and hetero[n]rotaxanes with precise control over the position of each macrocycle. The exceptional yield of the AT-CuAAC reaction, combined with optimized conditions that allow the rapid synthesis of the target oligomers, opens the door to the study of precision-engineered oligomeric interlocked molecules
Jack of all trades: anion and transition metal binding by bis-triazole receptors
作者:Nicholas G. White、Paul D. Beer
DOI:10.1080/10610278.2012.688124
日期:2012.7.1
aryl-substituted systems exhibiting significantly stronger halide association than the alkyl-substituted receptors. Both N-linked systems bind chloride more strongly than their C-linked analogues. Copper(I) and silver(I) cations were also demonstrated to bind to the receptors in solution and in the solid state. Four metal complexes were structurally characterised by X-ray crystallography – in all cases
合成了四个无环亚苯基-1,3-双-三唑受体,其杂环基序通过碳或氮共价连接到中心苯环。1H NMR 滴定实验表明,所有受体都与 d 6-丙酮溶液中的氯化物结合,其中芳基取代系统表现出比烷基取代受体明显更强的卤化物缔合。两个 N 连接系统都比它们的 C 连接类似物更牢固地结合氯。铜 (I) 和银 (I) 阳离子也被证明可以与溶液中和固态中的受体结合。通过 X 射线晶体学对四种金属配合物进行了结构表征——在所有情况下都提供了有趣的多核结构,观察到一个双核银 (I) 金属大环、一个三金属铜 (I) 和两个四核银 (I) 簇。
Formation of Metal-Assisted Stable Double Helices in Dimers of Cyclic Bis-Tetrapyrroles that Exhibit Spring-Like Motion
作者:Takashi Hashimoto、Takuma Nishimura、Jong Min Lim、Dongho Kim、Hiromitsu Maeda
DOI:10.1002/chem.201001605
日期:——
intramolecular oxidative biaryl coupling reactions, yielded [2+4]‐type ZnII‐assisted stable twisted‐ring dimers comprising two doublehelices. These [2+4]‐type metal complexes can be optically resolved by chiral HPLC and exhibit tunable electronic and optical properties as a result of spring‐like motions. The doublehelices behave as glue to connect two macrocycles and as the screws of hinges to form thermally
Two levels of conformational pre-organization consolidate strong CH hydrogen bonds in chloride–triazolophane complexes
作者:Yuran Hua、Raghunath O. Ramabhadran、Jonathan A. Karty、Krishnan Raghavachari、Amar H. Flood
DOI:10.1039/c1cc10428d
日期:——
Structural rigidity is verified as a pre-organizational factor that acts together with the macrocyclic effect such that synthesis helps in paying the cost of bringing together electropositive CH donors ready for H-bonding with chloride.