一个分子:一个中性离子受体,含有两个环酸子单元,在水溶液中具有显著的硫酸盐亲和力
Stefan Kubik1, R Kirchner, D Nolting
1Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität, Universitätsstrasse 1, D-40225 Düsseldorf, Germany. kubik@uni-duesseldorf.de
Journal of the American Chemical Society
|October 24, 2002
概括
这项研究介绍了一种新型的人工离子受体,该受体与各种离子形成稳定的1:1复合体. 接收器 接收器的接收器
科学领域:
- 超分子化学 超分子化学
- 主机和客人的化学反应
- 化学传感器 化学传感器
背景情况:
- 循环是有效的阴离子结合剂.
- 将两个循环单元相结合可以增强结合固基度和稳定性.
- 人工受体对于选择性离子识别至关重要.
研究的目的:
- 设计和合成一个二极管人造阳离子受体.
- 为了研究由受体形成的阴离子复合体的稳定性和稳定性.
- 阐明离子识别和结合亲缘关系的结构基础.
主要方法:
- 一个桥接的双环酸) 受体的合成.
- 电子喷射电离质谱仪 (ESI-MS) 用于复杂的石化测量.
- 核磁共振 (NMR) 光谱 (包括ROESY) 用于结构分析.
- 异热定位微热度计 (ITC) 用于热力学结合研究.
主要成果:
- 滴滴受体与化物,硫酸盐和酸盐形成稳定的1:1复合物.
- 复杂稳定常数范围从10^5到10^2 M^-1.
- 结合亲和力下降的顺序是SO4(2-) > I- > Br- > Cl- > NO3-.
- 更大的离子和更强的键相互作用增强了复杂的稳定性.
- 与单价受体相比,二受体表现出明显更高的结合亲和力.
结论:
- 桥接的bis (((cyclopeptide) 受体有效地与1:1固态度的阳离子结合.
- 阳离子大小和结能力是复杂稳定性的关键因素.
- 这种二极管受体代表了人工阴离子识别系统的进步.
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