Probing the dimensions of semi-rigid inner functionalised U-shaped bis-porphyrin cavities
作者:Shaun P. Gaynor、Maxwell J. Gunter、Martin R. Johnston、Ronald N. Warrener
DOI:10.1039/b601417h
日期:——
The synthesis of a series of open U-shaped bis-porphyrin cavity molecules is described, with bridged bicyclic backbones to confer rigidity, and a pendant substituted aromatic probe unit suspended on the inside of the cavity. The dimensions and flexibility of the bis-zincporphyrin cavity were probed using several different techniques. Initially the molecular ruler concept was employed, using flexible bidentate ligands as guests with a range of possible linear dimensions. Secondly, NMR methods were employed with rigid bidentate ligand guests of fixed lengths, and thirdly diffusion based NMR methods were utilised. The range of inter-porphyrin distances estimated by these methods suggests that these types of open-cavity systems have a surprising degree of flexibility.
本文描述了一系列U形双卟啉空腔分子的合成,这些分子具有桥联双环骨架,以赋予其刚性,并且空腔内部悬挂着一种取代芳族探针单元。使用多种不同的技术来探测双锌卟啉空腔的尺寸和柔性。首先,采用分子标尺概念,使用柔性双齿配体作为具有一系列可能线性尺寸的客体。其次,使用核磁共振方法,使用固定长度的刚性双齿配体客体,第三,使用基于扩散的核磁共振方法。通过这些方法估计的卟啉间距离范围表明,这些类型的开放空腔系统具有令人惊讶的柔性。