Abstract
The reactions of bis(organonitrile) platinum(II) complexes trans-[PtCl-2(N equivalent to CR)(2)] (R = C6H4(p-HC=O), CH2C6H4(p-CH3)) with pyrroline N-oxide-O+N=CHCH2CH2CMe2 afford arylamido platinum(II) complexes trans-[PtCl-2{(O=CR)N=CCH2CH2CMe2NH}(2)] (R = C6H4(p-HC=O) (1), CH2C6H4(p-CH3) (2)). The spectral data of 1 and 2 show that the oxadiazoline rings in both cases have opened by a spontaneous N-O bond cleavage to form (Z)-p-formyl-N-(5,5-dimethylpyrrolidin-2-ylidene)benzamide or (Z)-N-(5,5-dimethylpyrrolidin-2-ylidene)-2-p-tolylacetamide ligands, respectively, where the N-atoms of the benzamide or acetamide moieties coordinate to platinum(II) metal centre in trans positions. However, the reactions of bis(organonitrile) palladium(II) complexes trans-[PdCl-2(N equivalent to CR)(2)] with pyrroline N-oxide furnish Delta(4)-1,2,4-oxadiazoline palladium(II) complexes trans-[PdCl-2{N equivalent to C(R)ONC(H)CH2CH2CMe2}(2)] (R = C6H4(p-HCO) (3), CH2C6H4(p-CH3) (4)) as the exclusive detected products. Compounds 1-4 have been characterized by IR, H-1, C-13 NMR spectroscopy, elemental analyses, ESI+-MS and also, in the case of 1, by single crystal X-ray diffraction analysis. (C) 2018 Elsevier Ltd. All rights reserved.