Six-membered ring chelate complexes of Pd(II) and Pt(II) derived from di-(2-pyridyl)pyrimidin-2-ylsulfanylmethane, Gabriela Rodríguez-García, Noemí Andrade-López, José G. Alvarado-Rodríguez, Diego Martínez-Otero, Rafael Moreno-Esparza, Marcos Flores-Álamo, Polyhedron 2011, 30, 1324-1329. ISSN: 0277-5387. doi:10.1016/j.poly.2011.02.028
Cis-[MLCl2] complexes of di-(2-pyridyl)pyrimidin-2-ylsulfanylmethane ligand (L), where M = Pd (1), and M = Pt (2) have been synthesized. Reaction of 1 with L in presence of Na[BF4] and hot acetonitrile produced the complex [PdL2](BF4)2 (3). Complexes 13 and ligand L have been characterized by elemental analyses, IR and NMR spectroscopy. Crystal structures of 1, 3 and L were determined by single crystal X-ray diffraction analyses, showing nonplanar structures with the pyridinic rings twisted around the bridging carbon and the ipso carbon bonds. 1 and 3 displayed a bidentate coordination of L to the palladium atom with the formation of six-membered chelate rings, where the local geometry at palladium atom was distorted square planar. In 3 the palladium atom was coordinated to two dipyridyl ligands through two of the pyridinic nitrogen atoms to form a cationic complex stabilized by two tetrafluoroborate counter-ions.