Abstract
3-Aminopropyl(aryl)tellurides react with [Pt(PPh 3) 2(C 2H 4)] in dichloromethane to form tellurium-free platinum(II) complexes [PtCl(Ar)(PPh 3) 2] [ Ar = Ph( A ) , C 6H 4-4-OMe( A′)] along with Te(CH 2Cl){(CH 2) 3NH 2} ( B). The presence of Cl in the products clearly establishes the involvement of dichloromethane in the reaction. A free radical mechanism, involving Cl· and CH 2Cl· radicals from dichloromethane has been proposed for the reaction. The products have been characterized by 1H, 31P{ 1H} and 195Pt{ 1H} NMR and IR spectra. The structures of A and A′ have been determined by X-ray crystallography. The crystals belong to the orthorhombic crystal system, space group Pcba. The structure of the complex A′ has been described in detail. It adopts a square planar arrangement of the ligands around the Pt atom. The PPtP angle is 173.3(1)°, indicating the trans arrangement of the two triphenylphosphine groups around Pt. The PtCl distance is 2.40(4) Å and the PtC(1) distance is 2.01(1) Å, whereas the PtP(1) and PtP(2) distances are 2.318(5) and 2.306(5) Å, respectively. The square plane formed by P(1)C1P(2)C(1) is inclined at 70.0(5)° with respect to the plane of the six-membered ring attached to the Pt atom.
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