Chasing Weak Forces: Hierarchically Assembled Helicates as a Probe for the Evaluation of the Energetics of Weak Interactions
作者:David Van Craen、Wolfgang H. Rath、Marina Huth、Laura Kemp、Christoph Räuber、Jan M. Wollschläger、Christoph A. Schalley、Arto Valkonen、Kari Rissanen、Markus Albrecht
DOI:10.1021/jacs.7b10098
日期:2017.11.22
London dispersion forces are the weakest interactions between molecules. Because of this, their influence on chemical processes is often low, but can definitely not be ignored, and even becomes important in cases of molecules with large contact surfaces. Hierarchically assembled dinuclear titanium(IV) helicates represent a rare example in which the direct observation of London dispersion forces is
伦敦色散力是分子间最弱的相互作用。因此,它们对化学过程的影响通常很小,但绝对不能忽视,甚至在接触面大的分子的情况下变得很重要。分层组装的双核钛 (IV) 螺旋是一个罕见的例子,其中即使存在强内聚溶剂效应,也可以在溶液中直接观察伦敦色散力。因此,分散力不会无限制地支持二聚复合物的形成。尽管它们对单体复合单元的二聚化具有一些有利的焓贡献,但大的柔性取代基在构象上受到相互作用的限制,从而导致熵劣势。二聚螺旋体是熵不稳定的。