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Keywords:

  • hydrogen bonds;
  • naphthalene derivatives;
  • proton sponges;
  • structure elucidation;
  • zwitterions
Thumbnail image of graphical abstract

Not the expected structure 1, but the zweitterionic isomer 2 is found in crystals and solutions of the title compound. Molecules of 2 in the crystal form a type of belt, in which the positive part of the wzeitterion faces the negative part of its neighbor. This belt is coordinated to a corresponding second belt, in which the zwitterions are oriented in the opposite direction. This very interesting crystal packing prompts further studies of anisotropic crystal properties.