SYNTHESIS, CHARACTERIZATION an‎d NMR STUDIES OF NOVEL1 HEMILABILE NEUTRAL an‎d DICATIONIC PALLADIUM(II) COMPLEXES: Pd(eta^2-PH2PCH2CH2OCH3)2 an‎d Pd(eta^1-PH2PCH2CH2OCH3)2DIAMINE BY USING ETHER-PHOSPHINE LIGAND

The novel (ether-phosphine)palladium(II) complexes such as Cl2Pd(ƞ^1-Ph2PCH2CH2OCH3)2 2, [Pd(ƞ^2-Ph2PCH2CH2OCH3)2]^+22BF4^-3 and [Pd(ƞ^1-Ph2PCH2CH2OCH3)2diamine]^+22BF4^- 4L1-4L4 (Scheme1) have been obtained by reaction of [PdCl2(NCCH3)2 or PdCl2(NCPh)2] with two equimolar amounts of Ph2PCH2CH2OCH3 to produce complex 2. The dicationic complex 3 was produced by treating complex 2 with slightly excess amount of two equivalent of AgBF4 in CH2Cl2. Due to the hemilabile character, the(ether)oxygen atom of the ether-phosphine ligand immediately occupied the vacant coordination sites which created by chloride abstracted agent (AgBF4) and avoided complex decomposition. Several diamines were served as an incoming ligands, the (ether)oxygen atom can easily be displaced by these diamines to prepare complexes 4L1-4L4 in very good yields. These complexes were characterized by NMR, IR, and mass spectroscopy as well as by elemental analyses. Because of the ring contribution of the chemical shift the dissociation and association (open and close mechanism) of the weak donor can be studied by 31P{1H} NMR spectroscopy at room temperature.