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Keywords:

  • arsenic;
  • biradicals;
  • bonding;
  • heterocycles;
  • structure elucidation
Thumbnail image of graphical abstract

As you like it: The first reported four-membered heterocycle [As(μ-NTer)]2, which can be referred to as a high-temperature stable biradicaloid, is formed, when a bulky substituent, such as the terphenyl group, prevents dimerization. Addition reactions of elemental sulfur and selenium (see scheme) as well as the double bond of CS2 demonstrate that [As(μ-NTer)]2 has radical-type behavior.