synthesis, characterization and catalytic study of a novel binuclear paddle-wheel palladium(ii) complex in the mizoroki-heck reaction

A new binuclear paddle-wheel palladium(ii) complex of [pd2(μ-mtzt)4]dmgh2 (1) has been prepared by the treatment of pdcl2 in acetonitrile with mixture of 1-methyl-1h-1,2,3,4-tetrazole-5-thiol (hmtzt) and dimethylglyoxime (dmgh2) in methanol. resulted complex was characterized by elemental analysis (chns), ir, uv-vis absorption, 1h nmr spectroscopy and its structure was determined with single-crystal x-ray diffraction. single crystal analysis reveals that this complex has binuclear structure in a paddle-wheel fashion with pd-pd distances of 2.808(2) å. also, in this binuclear complex, each palladium(ii) ion has a slightly distorted square-pyramidal coordination geometry with the two nitrogen and two sulfur atoms in equatorial positions from four bridges mtzt- ligands and the second palladium subunit in axial position. catalytic potentiality of complex 1 is also exhibited in the mizoroki-heck coupling reactions between a range of aryl halides and olefins. the catalyst shows very much efficient reactivity in the mizoroki-heck reactions giving high yield of the coupling products.