Browsing by Author "Mohlala, Matshwenyego. Sarah"

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    Pyrazolyl palladium complexes with heterocyclic carbonyl linkers as catalyst precursors for ethylene and phenylacetylene polymerization.
    (University of the Western Cape, 2003) Mohlala, Matshwenyego. Sarah; Darkwa, James; Mapolie, Selwyn. F
    The pyrazolyl ligands 2,6-bis(3,5-r2p*azolylcarbonyl)pyridine {r : 'bu (l1), me (l2)),2,6-bis(3-methylpyrazolylcarbonyl)pyridine(l3)'2'6- bis(pyrazolylcarbonyl)pyridine (l4) and 2,5-bis(3,5-rzpyrazolylcarbonyl)thiophene { r :,bu (l5), me (l6) were prepared by the reaction of 2,6-pyridinedicarbonyl dichloride and 2,5-thiophenedicarbonyl dichloride with the appropriate pymzoles and were characterizedby,h,',c1'h}nmr,irspectroscopyandelementalanalysis.reactions of the ligands l1-l3, l4 and l5 and pdclzuecn)z in a ratio of 1:1 yielded mononuclear and binuclear complexes [2,6-bis(3,5-rzpyrazolyl-1. carbonyl)pyridinelpalladiumod dichloride tr : 'bu (1), me (2))' [2'6-bis(3- methylpyrazolyl-1-carbonyl)pyridinelpalladium@) dichloride (3) and di-p-chlorodichlorobis[ 2,5-bis(rzpyrazolyl 1+arbonyl)thiophene]dipalladium(tr) {r : tbu (4)' r : me (5)). complex i was characterized by th' "c1th) nmr' ir spectroscopy and elemental analysis while complexes 2-5, which were insoluble in most common organic solvents, were charac teizedby elemental analysis and ir spectroscopy' the structures of the ligands l3,l6and complex 1, deduced ft'om spectroscopic studies' were confirmed by single crystal x-ray diftaction analysis'