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The title complex, [Nb(C 7 H 12 N 3 ) 4 ]PF 6 , features chelating hpp anions (hpp is 1,3,4,6,7,8-hexahydro-2 H -pyrimido[1,2- a ]pyrim­idine) that define a distorted dodeca­hedral coordination geometry based on an N 8  donor set. The Nb atom is situated on a site of symmetry, and the PF 6−  anion has crystallographic fourfold symmetry.

acta crystallographica. section e

Tetrakis(1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidin-9-ido-κ2 N 1,N 9)niobium(V) hexafluoridophosphate