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Keywords:

  • copper compounds;
  • phosphorus compounds;
  • solidstate structures
Thumbnail image of graphical abstract

A one-dimensional, infinite phosphorus screw consisting of P12 units is present in crystals of (CuI)3P12. Theoretical calculations had predicted that this previously unknown form of phosphorus would be thermodynamically stable. Flat shiny needles of (CuI)3P12 have now been prepared from CuI and elemental phosphorus, and the new phosphorus allotrope has been characterized by X-ray diffraction (picture on the right, P: black, Cu: shaded, and I: white circles).