Palladium(II) saccharinate (sac) and thiosaccharinate (tsac) complexes with 2-aminopyridine (2-ampy), 2-acetylaminopyridine (2-aampy) and 2-acetylaminopyrimidine (2-aampym) co-ligands: X-ray crystal structures of trans-[Pd(sac)2(ampy)2] and solvatomorphs

Reactions of trans-[PdCl2L2] (L = 2-aminopyridine, 2-aminoacylpyridine or 2-aminoacylpyrimidine) with two equivalents of sodium saccharinate (Nasac) affords mixed-ligand complexes trans-[Pd(sac)2L2]. The X-ray structures of trans-[Pd(sac)2(2-ampy)2] and trans-[Pd(sac)2(2-aampy)2] show the saccharinate ligands coordinate in a monodentate fashion via the endocyclic amido group. In trans-[Pd(sac)2(2-ampy)2] the ligands adopt a relative anti/anti-configuration, while in trans-[Pd(sac)2(2-aampy)2] they adopt a syn/syn-configuration, the latter possibly resulting from intramolecular hydrogen bonding between the amine protons and the carbonyl oxygen. Reactions of trans-[PdCl2L2] with thiosaccharin (tsacH) afford either trans-[Pd(tsac)2(2-ampy)2] or [Pd(tsac)2], the latter resulting from elimination of the nitrogen-donor ligands.