合成并表征了在下边缘装饰有末端羟基的三种水溶性N-烷基间苯二甲酰氯。受体在上边缘用末端羟基,刚性环己基或柔性苄基修饰。通过1 H NMR光谱,荧光光谱和等温滴定量热法(ITC)研究了这些受体对三种紫精衍生物的结合亲和力,其中三种紫精衍生物中的两个乙酰甲基基团与一个吡啶氮原子相连。ITC对结合过程的定量给出了高达10 3 M –1的缔合常数。分析显示自发的结合过程都是放热的,并且是焓和熵驱动的。
Hydrogen-bonded capsules constrain molecules into small spaces, where they exhibit behavior that is inaccessible in bulk solution. Water competes with the formation of hydrogen bonds, and other forces for assembly, such as metal/ligand interactions or hydrophobic effects, have been applied. Here we report the reversible assembly of a water-soluble cavitand to a robust capsule host in the presence of suitable
A Carbohydrate-Conjugated Deep Cavitand Permits Observation of Caviplexes in Human Serum
作者:Daniel A. Ryan、Julius Rebek
DOI:10.1021/ja2055676
日期:2011.12.14
A deep cavitand was covalentlymodified with carbohydrates to provide solubility in biologically relevant environments and to investigate its receptor function. Specifically, a tetrakis(β-D-glucosyl) cavitand (1) that was soluble in neutral water or acid/base-buffered solutions was synthesized, and it formed complexes with hydrophobic small molecules. Extraction of the cavitand into aqueous sodium
Complexation of chiral amines by resorcin[4]arene sulfonic acids in polar media – circular dichroism and diffusion studies of chirality transfer and solvent dependence
作者:Bartosz Setner、Agnieszka Szumna
DOI:10.3762/bjoc.15.187
日期:——
conformationally well-defined complexes in polar environment is still a major challenge in supramolecular chemistry. In the present study we demonstrate that resorcin[4]arene sulfonic acid (RSA) interacts with chiral amines (amino acid derivatives and aminocavitands) to form inclusion complexes and capsules based on electrostatic interactions. The complexes were characterized by circulardichroism and DOSY NMR spectroscopy
Directional self‐assembly of uncharged molecules in water is a major challenge in supramolecular chemistry. Herein, it is demonstrated that peptide‐basedcavitands wrap around a hydrophobic core (fullerene C60) by a combination of the hydrophobic effect and hydrogen‐bonding interactions to form highly ordered three‐component complexes in water that resemble the molten‐globule stage of protein folding