Platinum metal complexes with some new bifunctional ligands - I. Pyrazole amide complexes with PdII and PtII

Article abstract of DOI:10.1016/0277-5387(95)00229-4

The pyrazolyl group has been used in conjuction with the amido group for the design and synthesis of a new series of bifunctional ligands, PzCH₂C(O)NHR, where Pz = 1-pyrazolyl 3,5-dimethyl-1-pyrazolyl; R = H(APz/ADMPz), Me(MAPz/MADMPz), Ph(PAPz/PADMPz). These ligands have been characterized based on their mass, IR, ¹H and ¹³C{H} NMR spectra and their complexes with Pd^II and Pt^II reported. Simple mixing of aqueous solutions of K₂[MCl₄] (M = Pd. Pt) and the pyrazole amide in a 1:2 ratio gave neutral complexes of the type cis-MCl₂L₂;. Alternatively, an aqueous solution of K₂[MCl₄] added to an aqueous solution of ligand at pH - 8.0 afforded neutral bis-chelates of the type ML₂. A neutral monodentate coordination (LH) has been assigned for the ligand in the former complexes, whereas uninegative bidentate coordination through deprotonated amide nitrogen has been assigned in the latter complexes.