Palladium(II) complexes containing ‘mixed’ nitrogen–arsenic polydentate ligands

Abstract

R = H, Me, and Et, to form a series of four-co-ordinate, square planar complexes of stoicheiometry PdX,L, when X = CI, Br, and I and L represents any one of the aforementioned ligands. In addition, the S-bonded thiocyanate compfexes,Pd(SCN),L, were prepared for all three bidentate ligands. The explanations for the isolation of only the S-bonded isomer and the inability to prepare five-co-ordinate complexes are discussed.DIVALENT palladium generally forms four-co-ordinate, square planar complexes with a variety of ligands. However, five-co-ordinate palladium( 11) complexes, although by no means as numerous, have been known for some time, primarily as a result of the preliminary work in this area by Venanzi,l Nyholm,2 and Chatt.3 In 1965, Westland found in the case of Group V donor atoms the tendency to promote five-co-ordination for PdIr increased in the order N < P < As < Sb for the ligands investigated. It was suggested that the increased x-

Synthesis and characterization of binuclear platinum group metal complexes of novel hexadentate ligands .alpha.,.alpha.'-bis(bis(2-(diphenylphosphino)ethyl)amino)-p-xylene and .alpha.,.alpha.'-bis(bis(2-(diphenylarsino)ethyl)amino)-p-xylene

“…33 The 31P chemical shifts of complexes 16, 18, and 19 (Table 111) increase as the halogen changes from chloride to bromide and to a pseudohalogen (SCN) in the coordination sphere of the metal ion. 33 The 31P chemical shifts of complexes 16, 18, and 19 (Table 111) increase as the halogen changes from chloride to bromide and to a pseudohalogen (SCN) in the coordination sphere of the metal ion.…”