functioning in pure water are rare in supramolecular chemistry. Moreover, studies on adjusting the affinity of such receptors toward anions in water are absent from the literature. Two new bambusurils, 1 a and 2 a, were prepared to demonstrate that the affinity of bambusurils towards anions can be altered by the length of carboxyalkyl groups attached to the macrocycles. The stability of the bambusuril
Functionalized Chiral Bambusurils: Synthesis and Host‐Guest Interactions with Chiral Carboxylates
作者:Jan Sokolov、Adam Štefek、Vladimír Šindelář
DOI:10.1002/cplu.202000261
日期:2020.6
properties in terms of carboxylatebinding were studied by means of NMR in DMSO‐d 6. The reported bambusurils bind selected chiral carboxylates with enantioselectivity factors up to 3.1. The results indicated that the selectivity towards different carboxylates is governed by the steric constraint of the substituents surrounding bambusuril portals. No clear trend in the binding affinities and their
氨苄青霉素是一类具有显着阴离子识别特性的大环阴离子受体,能够与各种无机阴离子以及羧酸盐或磺酸盐结合。最近,我们报道了使用非功能化手性bambusuril衍生物对手性羧酸酯的对映选择性识别。本文中,我们报道了两个新的具有酯官能团的手性bambusuril大环代表化合物的合成和客体特性,它们之间的取代基不同。通过DMSO- d 6中的NMR研究了它们在羧酸盐结合方面的超分子特性。报道的樟脑丸以高达3.1的对映选择性因子结合选择的手性羧酸盐。结果表明,对不同羧酸盐的选择性受孟买素门户周围的取代基的空间约束所支配。没有发现结合亲和力及其对映选择性的明显趋势。
Fluorinated Bambusurils as Highly Effective and Selective Transmembrane Cl−/HCO3− Antiporters
bambusurils to complex Cl− and HCO3− simultaneously, facilitating their exchange at the bilayer interface. Furthermore, the exceptionally high affinity and selectivity of these systems for NO3− appear to contribute to the poor Cl−/NO3− exchange. This work not only demonstrates the importance of anion binding characteristics on anion transport but also the potential relevance of bambusurils for anion transport
Bambusurils are recently developed neutral anion receptors that show a highaffinity towards many inorganic anions, not only in organic solvents but also in water. However, the number of water-soluble bambusurils and also those bearing functional groups is very limited. In this paper we report the synthesis of four- and six-membered bambusurils containing eight and twelve nitro groups. All the nitro
synthesis of a water‐soluble bambusuril derivative is shown to be an outstanding receptor for various inorganic anions in pure water, with association constants of up to 107 L mol−1. Furthermore, the macrocycle discriminates between anions with unprecedented selectivity (up to 500 000‐fold). We anticipate that the combination of remarkable affinity and selectivity of this macrocycle will enable the
在水中起作用的合成受体对于定性和定量检测阴离子至关重要,这些阴离子可能在环境中充当污染物或在生物过程中发挥重要作用。中性受体特别吸引人,因为它们通常比带正电的受体更具选择性。但是,它们对纯水中阴离子的亲和力仅为1–10 3 L mol -1。以阴离子为模板的水溶性樟脑碱衍生物的合成被证明是纯水中各种无机阴离子的杰出受体,缔合常数高达10 7 L mol -1。此外,大环化合物以前所未有的选择性(高达50万倍)区分阴离子。我们预计,这种大环的显着亲和力和选择性相结合,将能够有效检测和分离水溶液中的各种阴离子,而这在当前的超分子系统中是不可能的。