Acta Crystallographica Section E (Sep 2008)

Tetrakis(1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidin-9-ido-κ2N1,N9)niobium(V) hexafluoridophosphate

  • Edward R. T. Tiekink,
  • Nattamai Bhuvanesh,
  • Pavel V. Poplaukhin,
  • Carlos A. Murillo,
  • F. Albert Cotton

DOI
https://doi.org/10.1107/S1600536808026627
Journal volume & issue
Vol. 64, no. 9
pp. m1197 – m1197

Abstract

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The title complex, [Nb(C7H12N3)4]PF6, features chelating hpp anions (hpp is 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine) that define a distorted dodecahedral coordination geometry based on an N8 donor set. The Nb atom is situated on a site of symmetry overline{4}, and the PF6− anion has crystallographic fourfold symmetry.