Moritz publication on „Cyclo-P₅^‒ Revisited: The Surprisingly Stable Uncoordinated Pentaphospholide Anion“ is now published in Angew. Chem. Int. Ed. Although the cyclo-P5− anion is spectroscopically known since the 1980s it was so far prepared and handled only in solution. By complexing the alkali metal cation with [2.2.2]cryptand, the product was found to be surprisingly stable in the solid state. Cyclo-P₅^‒, which is isolobal to the well-known cyclopentadienyl anion, was now characterized crystallographically for the first time. The structural elucidation proves its planar D_5h symmetry, not only as ligand in different sandwich complexes but also in its uncoordinated form. 

Congratulations and big thanks to our cooperation partners in Rostock!

DOI: 10.1002/anie.202505853

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