Hydrophilic and hydrophobic carboxamide pincers as anion hosts
作者:Jessica Lohrman、Subhamay Pramanik、Sandeep Kaur、Hanumaiah Telikepalli、Victor W. Day、Kristin Bowman-James
DOI:10.1039/d1ob01605a
日期:——
“Bare bones” pyridine dicarboxamide and pyrazine tetracarboxamide pincer frameworks were used to probe supramolecular anion binding. The influence of hydrophilic vs. hydrophobic environments and the potential for synergistic interactions in the ditopic hosts were explored.
Biphenyl macrolactams in anion complexation. Selective naked-eye fluoride recognition
作者:Ana M. Costero、M. José Bañuls、M. José Aurell、Michael D. Ward、Stephen Argent
DOI:10.1016/j.tet.2004.07.088
日期:2004.10
Two colorimetric anion sensors 1 and 2 allow for the selective differentiation of fluoride in the presence of other anions. Two different types of species have been observed in the complexation process, one of them is a co-ordination complex and the other is a salt generated by ligand deprotonation. The deprotonation reaction induces a conformational change, giving rise to a symmetrical species. This
Copper(<scp>ii</scp>)-directed synthesis of neutral heteroditopic [2]rotaxane ion-pair host systems incorporating hydrogen and halogen bonding anion binding cavities
作者:Asha Brown、Katrina M. Mennie、Owen Mason、Nicholas G. White、Paul D. Beer
DOI:10.1039/c7dt02832f
日期:——
Neutral heteroditopic [2]rotaxane ion-pair host systems were synthesised via a Cu(II) directed passive metal template strategy. Each rotaxane contains discrete, axle-separated interlocked bindingsites for a guest anion and a transition metal countercation. The anionbindingsites are composed of convergent X–H (X = C, N) hydrogen bond donor groups, or mixed X–H and C–I hydrogen and halogen bond donor
通过Cu(II)定向的被动金属模板策略合成了中性异位双[2]轮烷离子对宿主系统。每个轮烷均包含离散的,轴分隔的互锁的结合位点,用于客体阴离子和过渡金属抗衡阳离子。阴离子结合位点由会聚的X–H(X = C,N)氢键供体基团,或混合的X–H和C–1氢和卤素键供体基团组成,而等效的三维阵列的胺,吡啶羰基氧供体基团构成过渡金属结合位点。在CDCl 3 / CD 3 OD或CDCl 3 / CD 3 OD / D 2中的1 H NMR滴定实验O溶剂混合物表明,异位[2]轮烷主系统能够在存在共键合的Zn(II)阳离子的情况下进行协同阴离子识别。
Solid–liquid extraction of ω-amino acids using ditopic receptors
作者:Ana M. Costero、Gemma M. Rodríguez-Muñiz、Salvador Gil、Sergio Peransi、Pablo Gaviña
DOI:10.1016/j.tet.2007.10.066
日期:2008.1
Five heteroditopic ligands have been prepared to be used in solid-liquid extraction of omega-amino acids into DMSO solutions. The prepared ligands contain crown ethers as cation binding sites and thiourea or amide groups for anion recognition. The aliphatic zone of the (1)H NMR spectra suggests that two different species related to the amino acid are present in solution. One of these species is the complexed zwitterionic form and the other seems to be free non-zwitterionic amino acid. The presence of these two species allows extraction efficiencies higher than 100%. (c) 2007 Elsevier Ltd. All rights reserved.
two new molecular turnstiles based on Sn–porphyrin derivatives are described. The system is composed of a stator (5‐(4‐pyridyl)‐10,15,20‐triphenylporphyrin), a hinge (SnIV) and a rotor (handle equipped with 2,6‐pyridinedicarboxamide as a tridentate coordinating site or its PdII complex). The presence of interaction sites, both on the stator and the rotor, offers the possibility of switching between