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Keywords:

  • charge density;
  • chlorine;
  • crystal engineering;
  • halogen bonding;
  • supramolecular chemistry

Abstract

Thumbnail image of graphical abstract

Slightly attractive: The attractive and anisotropic nature of the Cl⋅⋅⋅Cl interaction in C6Cl6 is experimentally demonstrated from an expansion of the electron density ρ(r) around the chlorine nuclei. The interaction is explained in a model in which there is a bonding attraction involving electron-deficient (see picture, blue) and electron-rich (red) regions of adjacent Cl atoms.