Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (10): 1365-1368.DOI: 10.6023/A22080368 Previous Articles     Next Articles

Special Issue: 有机氟化学合集

Communication

基于分子间卤键的超分子平面大环自组装

刘传志a, 李芬a, 王静静a, 赵晓璐a, 张婷美a, 黄鑫a, 邬梦丽a, 户志远a, 刘新明a,*(), 黎占亭b,*()   

  1. a 商丘师范学院 化学化工学院 药物绿色合成河南省工程实验室 商丘 476000
    b 复旦大学 化学系 上海市分子催化与功能材料重点实验室 上海 200438
  • 投稿日期:2022-08-30 发布日期:2022-10-08
  • 通讯作者: 刘新明, 黎占亭
  • 基金资助:
    河南省高等学校重点科研项目计划(21A150045); 商丘师范学院博士启动经费(700200); 商丘师范学院博士启动经费(700205)

Self-assembly of Supramolecular Planar Macrocycle Driven by Intermolecular Halogen Bonding

Chuanzhi Liua, Fen Lia, Jingjing Wanga, Xiaolu Zhaoa, Tingmei Zhanga, Xin Huanga, Mengli Wua, Zhiyuan Hua, Xinming Liua(), Zhanting Lib()   

  1. a School of Chemistry and Chemical Engineering, Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
    b Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, China
  • Received:2022-08-30 Published:2022-10-08
  • Contact: Xinming Liu, Zhanting Li
  • Supported by:
    Key Scientific Research Projects of Colleges and Universities of Henan Province(21A150045); Start-up Foundation for Scientific Research of Newly Recruited PhD of Shangqiu Normal University(700200); Start-up Foundation for Scientific Research of Newly Recruited PhD of Shangqiu Normal University(700205)

The design and synthesis of three kinds of arylamide molecules (compounds 1~3) containing halogen bonding donor and acceptor fragments, and the exploration and analyzation of different action modes of halogen bonding in solid phase were reported. Compounds 1 and 2 contain two tetrafluoroiodobenzene fragments, and compound 1 also contains a halogen receptor fragment—pyridine group. Isobutyl groups are introduced into the molecule to increase its solubility and crystallinity. And a pyrimidine fragment was introduced into compound 3, which has more aromatic rings. The two N atoms of the pyrimidine fragment can theoretically form intramolecular hydrogen bonds with the adjacent amide hydrogen atoms (—C(=O)NH), so that the whole molecule has the properties of hydrogen-bonded arylamide foldamer. Moreover, trifluorobenzene fragments were selected in compound 3 to eliminate the repulsion between excess fluorine atoms and carbonyls. The crystal structures reveal that the three aromatic rings in compound 1 are twisted with each other for there is no intramolecular hydrogen bond, and a supramolecular DNA-like double helix was assembled controlled by intermolecular N···I and O···I halogen bonds arranged alternately. Compound 2 failed to form an intramolecular three-center hydrogen bonding due to the repulsion between the amide carbonyl groups and the two fluorine atoms in close proximity. As expected, in the solid phase of compound 3, an effective three-center hydrogen bond is formed between the terminal trifluoroiodobenzene and the benzene ring attached to it. Moreover, the two N—H bonds connected to the pyrimidine ring also form two effective three-center hydrogen bonds. The difference is that the participants of these two groups of three-center hydrogen bonds include two N atoms in the pyrimidine ring. The four aromatic rings in compound 3 are nearly coplanar driven by these intramolecular three-center hydrogen bonds. Two sets of strong intermolecular (pyridine ring) N···I halogen bonds control the formation of [1+1] bimolecular supramolecular macrocycles with inner diameters of 1.36 nm and 1.07 nm in length and width. Moreover, the supramolecular macrocycle is near-planar due to the introduction of pyrimidine ring.

Key words: halogen bond, hydrogen bond, crystal engineering, supramolecular interaction, bimolecular macrocycle