sym-[5.5.5]Heterocyclophanes: structurally well-defined, mixed π/heteroatom-donor macrobicyclic cages
作者:Jens Hansen、Alexander J. Blake、Wan-Sheung Li、Mark Mascal
DOI:10.1039/a805646c
日期:——
Structural considerations for achieving conformational stability in cyclophanes are applied as design criteria in the synthesis of sym-[5.5.5]triaza- and sym-[5.5.5]trioxacyclophane macrobicycles. These compounds act as dynamic hosts in which the metal ion migrates between equivalent, C3-related (η1-C)2N2 coordination sites. The metalâarene interaction may alternatively be described as three centre, two-electron Ï complexation to the CâH bond. Crystal structures of the copper(I) and silver(I) complexes show that little reorganization is required on the part of the ligand to accommodate the metal, and the former provides an unusual, structurally characterized example of eta-bonding of an arene to CuI.
在合成 sym-[5.5.5]triaza- 和 sym-[5.5.5]trioxacyclophane 大双环化合物时,将实现环烷构象稳定性的结构因素作为设计标准。这些化合物作为动态宿主,其中的金属离子在等价的 C3 相关 (δ-1-C)2N2 配位位点之间迁移。金属与烯烃的相互作用也可描述为三个中心、两个电子与 CâH 键的 Ï 复合作用。铜(I)和银(I)配合物的晶体结构显示,配体几乎不需要重组就能容纳金属,前者提供了一个不寻常的、具有结构特征的炔与 CuI 的等键结合实例。