Construction of π‐Surface‐Metalated Pillar[5]arenes which Bind Anions via Anion–π Interactions

作者：Bo Jiang; Wei Wang; Ying Zhang; Ye Lu; Chang‐Wei Zhang; Guang‐Qiang Yin; Xiao‐Li Zhao; Lin Xu; Prof. Dr. Hongwei Tan; Prof. Dr. Xiaopeng Li; Prof. Dr. Guo‐Xin Jin; Prof. Dr. Hai‐Bo Yang

来源：Angewandte Chemie, 2017, 129(46): 14630-14634.

DOI：10.1002/ange.201707209

• Anion-π-Wechselwirkungen
• Makrocyclen
• Metallierung
• Wirt-Gast-Chemie

By simple ligand exchange of the cationic transition‐metal complexes [(Cp*)M(acetone)\u003csub\u003e3\u003c/sub\u003e](OTf)\u003csub\u003e2\u003c/sub\u003e (Cp*=pentamethylcyclopentadienyl and M=Ir or Rh) with pillar[5]arene, mono‐ and polynuclear pillar[5]arenes, a new class of metalated host molecules, is prepared. Single‐crystal X‐ray analysis shows that the charged transition‐metal cations are directly bound to the outer π‐surface of aromatic rings of pillar[5]arene. One of the triflate anions is deeply embedded within the cavity of the trinuclear pillar[5]arenes, which is different to the host–guest behavior of most pillar[5]arenes. DFT calculation of the electrostatic potential revealed that the metalated pillar[5]arenes featured an electron‐deficient cavity due to the presence of the electron‐withdrawing transition metals, thus allowing encapsulation of electron‐rich guests mainly driven by anion–π interactions.

• 单位
  华东师范大学