Macrocyclic Receptor for Precious Gold, Platinum, or Palladium Coordination Complexes
Macrocyclic Receptor for Precious Gold, Platinum, or Palladium Coordination Complexes
复制标题
DOI：
10.1021/jacs.8b04155
复制
发表时间：
2018-06-06
影响因子：
15
通讯作者：
Smith, Bradley D.
中科院分区：
文献类型：
--
作者：
Liu, Wenqi;Oliver, Allen G.;Smith, Bradley D.
两个大环四内酰胺受体显示出选择性地封装阴离子，正方形平面的氯和溴的金（III），铂（II），和钯（II）的配位络合物。这两种受体都具有与其贵金属客体互补的预组织结构。受体不直接连接客体金属中心，而是提供与正电性金属相互作用的芳烃π电子供体和与外部负电性配体相互作用的氢键供体的阵列。这种独特的超分子识别模式通过六种X射线晶体结构来说明，显示AuCl 4-、AuBr 4-、PtCl 4 -2或Pd 2Cl 6 -2的受体包裹。在有机溶液中，1：1的缔合常数与特定的超分子特征在固态中确定。使用这些受体的技术应用被设想在涉及贵金属的广泛领域中，包括采矿、回收、催化、纳米科学和医学。
Two macrocyclic tetralactam receptors are shown to selectively encapsulate anionic, square-planar chloride and bromide coordination complexes of gold(III), platinum(II), and palladium(II). Both receptors have a preorganized structure that is complementary to its precious metal guest. The receptors do not directly ligate the guest metal center but instead provide an array of arene pi-electron donors that interact with the electropositive metal and hydrogen-bond donors that interact with the outer electronegative ligands. This unique mode of supramolecular recognition is illustrated by six X-ray crystal structures showing receptor encapsulation of AuCl4-, AuBr4-, PtCl4-2, or Pd2Cl6-2. In organic solution, the 1:1 association constants correlate with specific supramolecular features identified in the solid state. Technical applications using these receptors are envisioned in a wide range of fields that involve precious metals, including mining, recycling, catalysis, nanoscience, and medicine.