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-
Die pseudotetraedrischen Komplexe (I) wurden durch Umsetzung der Co(II)‐ halogenide mit den Ammonium‐ bzw. Phosphoniumsalzen oder den nicht protonierten Aminen in Äthanol unter Rückfluß erhalten.
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