(IUCr) Crystallography Journals Online

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Acta Cryst. (2008). E64, m1197 [ doi:10.1107/S1600536808026627 ]

Tetrakis(1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidin-9-ido-²N¹,N⁹)niobium(V) hexafluoridophosphate

F. A. Cotton, C. A. Murillo, P. V. Poplaukhin, N. Bhuvanesh and E. R. T. Tiekink

Abstract: 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.

Online 23 August 2008

Tetrakis(1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidin-9-ido-2N1,N9)niobium(V) hexafluoridophosphate

F. A. Cotton, C. A. Murillo, P. V. Poplaukhin, N. Bhuvanesh and E. R. T. Tiekink

Tetrakis(1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidin-9-ido-²N¹,N⁹)niobium(V) hexafluoridophosphate