Synthesis and characterisation of κ1-P and κ2-P,N palladium(II) complexes of the open cage water soluble aminophosphine PTN

New palladium(II) complexes containing the water soluble aminophosphine PTN ligand (PTN = 7-phospha-3,7-dimethyl-1,3,5-triazabicyclo[3.3.1]nonane) in 1:1 and 1:2 ratio Pd/PTN ligand, respectively, were prepared and fully characterised by mono and bidimensional 31P, 1H and 13C NMR techniques showing that PTN can adopt both κ1-P and κ2-P,N coordination modes. The complexes with Pd/PTN ratio 1:2 are highly soluble in water at room temperature. Suitable crystals for X-ray structure determination were obtained for the neutral complex κ2-P,N-Pd(PTN)(OAc)2 (1) and for the monocationic complex [Pd(κ2-P,N-PTN)(κ1-P-PTN)Cl][PF6] (5).