The first di-μ-hydroxo-bridged binuclear copper complex containing a bis-guanidine ligand

The present structure determination of di- mu-hydroxobis{[ N, N'- bis( dipiperidinomethylene) propane- 1,3- diamine- kappa(2) N, N'] copper( II)} bis( hexafluorophosphate), [ Cu-2( OH) (2)-( C25H46N6) (2)]( PF6) (2), is the first to crystallographically characterize a Cu-2(mu- OH) (2) complex with a bidentate guanidine ligand. The cation lies on a crystallographic inversion centre and shows planar fourfold coordination of the copper centres. The Cu-2( mu- OH) (2) species can be distinguished from Cu-2(mu- O) (2) by the Cu - O bond lengths. The packing is determined by strong intermolecular anion - cation hydrogen bonds.