作者:Sylvie Meyer、Re´my Louis、Bernard Metz、Yvette Agnus、Alexandre Varnek、Maurice Gross
DOI:10.1039/b001127o
日期:——
The
X-ray structures of three potential molecular tweezers, C20H24N2O5 (1), C20H20N6O13 (2) and C28H32N2O13
(3), differing
only by the substituents on the terminal aromatic moieties, display three as yet unreported arrays. Hydrogen
bonding with co-crystallized water molecules as well as van der Waals interactions between terminal
aromatic moieties lead to specific packing patterns, namely: (i) a membrane-like architecture of associated molecular tapes in 1·2H2O, (ii) coupled right-handed and left-handed helices in 2·H2O and (iii) a stepped arrangement provided by a back-to-back pairing in (3)2·H2O. Molecular modelling of individual molecules in vacuo shows
that the most stable conformers of 1–3
intrinsically display attractive interactions between the terminal aromatic
groups, which stabilize a pseudocavity suitable for incorporation of a guest compound.
三种潜在的分子钳夹的X射线结构,C20H24N2O5 (1)、C20H20N6O13 (2) 和 C28H32N2O13 (3),仅在末端芳香基团的取代基上有所不同,显示出三种迄今未报道的排列方式。与共结晶水分子形成氢键以及末端芳香基团之间的范德华相互作用,导致特定的堆积模式,即:(i) 1·2H2O中关联的分子带状的膜状结构,(ii) 2·H2O中耦合的右旋和左旋螺旋,(iii) (3)2·H2O中通过背对背配对形成的阶梯状排列。在真空中的单个分子分子建模显示,1–3的最稳定构象本质上是末端芳香基团之间的吸引力相互作用,这种相互作用稳定了一个适合容纳客体化合物的伪腔。