A palladium(Ⅱ) complex, PdLCl2·PdCl4, L=4-bromo-2,6-bis(N,N-diethylaminomethylene)pyridine, was synthesized and its crystal structure was determined by X-ray analysis. The complex crystallizes in monoclinic system with space group Cc, a=0.845 1(17) nm, b=1.836 5(4) nm, c=2.715 8(5) nm, β=93.99(3)°, V=4.204 8(15) nm3, Z=4, R1=0.037 7 and wR2=0.076 9. The coordination geometry of the Pd atom in the cation is a slightly distorted square planar, with one pyridyl N and two N atoms of the diethylamine ligand, together with one Cl atom. The dihedral angle between the square planar (N3PdCl) and the pyridyl ring is 10.3(4)°. CCDC: 623421.
Three stable 4-substituted pyridine-based ruthenium（II）complexes[RuCl2（PPh3）L]（L=4-R-2,6-bis （diethylaminomethylene）pyridine,R=Br,H or allyloxy）were synthesized.The catalytic activities of the complexes toward transfer hydrogenation from alcohols to ketones were investigated.The electronic effects of the para-substituent in the pyridyl ring were probed and we found that the electron-donating group increased the catalytic activity.The result suggests that an electron-donating group is probably preferential for linking the catalytic ruthenium complex and the chemically inert supporting molecules such as a carbosilane dendrimer.
