1258271-17-8Relevant articles and documents
Manganese(II), nickel(II), and palladium(II) complexes of a terpyridine-Like ligand containing a sulfur linkage, and an analogous NCN pincer palladium(II) complex: Synthesis, characterization, and Pd-Catalyzed reactions
Hirotsu, Masakazu,Tsukahara, Yuhei,Kinoshita, Isamu
, p. 1058 - 1066 (2010)
Coordination properties of new polypyridines containing a single sulfur linkage, 6-(2″-pyridylthio)-2, 2′-bipyridine (L1) and 1-(2′-pyridyl)-3-(2″-pyridylthio)benzene (HL2), are described. The manganese(II) and nickel(II) complexes of the terpyridine-like ligand L1, [MnCl2(L1)] (1), [NiCl(μ-Cl)(L1)]2 (2), and [Ni(L1)2](SbF6)2 (3), were prepared and characterized by UV-vis spectroscopy and X-ray crystallography. The palladium(II) complex [PdCl(L1)]Cl (4) was synthesized from L1 and Li 2[PdCl1] at room temperature, while the corresponding NCN pincer complex of L2, [PdCl(L2)] (5), was synthesized in DMSO at 150 °C by cyclopalladation of the ligand precursor HL2. The crystal structures of 4 and 5 revealed similar coordination geometries around Pd except for the longer Pd-Cl distance in 5, which is induced by the strong trans influence of the Pd-C bonding. The NMR spectra of 4 showed partial dissociation of L1 in DMSO-d 6, which was not observed for L2 in 5. Catalytic activities of 4 and 5 for the Mizoroki-Heck reaction were investigated, and the lower activity of 5 can be related to the strong σ-donating character of L2.
