Alternating 2,6-/3,5-substituted pyridine-acetylene macrocycles: π-stacking self-assemblies enhanced by intermolecular dipole-dipole interaction

Org Lett. 2014 Feb 7;16(3):828-31. doi: 10.1021/ol403579e. Epub 2014 Jan 21.

Abstract

Macrocyclic compounds consisting of three 2,6-pyridylene and three 3,5-pyridylene units linked by acetylene bonds were synthesized by a Sonogashira reaction. The X-ray structures showed π-stacked pairs of two macrocycles, in which a 2,6-pyridylene unit of the one molecule overlaps a 3,5-pyridylene of the other molecule because of dipole-dipole interaction. Atomic force microscope (AFM) measurements revealed fibril structures indicating the stacking of the rigid planar macrocycles. Hydrogen-bonding ability of the macrocyclic inside was demonstrated by the addition of octyl β-D-glucopyranoside.

MeSH terms

  • Acetylene / chemistry*
  • Crystallography, X-Ray
  • Hydrogen Bonding
  • Macrocyclic Compounds / chemical synthesis*
  • Macrocyclic Compounds / chemistry*
  • Molecular Structure
  • Pyridines / chemistry*

Substances

  • Macrocyclic Compounds
  • Pyridines
  • pyridine
  • Acetylene