SYNTHESIS AND CHARACTERIZATION OF THE FREE LIGAND 5,6 INO)-7,12-DIOXO-1,4,8,11-TETRAAZACYCLOTETRA-DECANE AND ITS MONO AND TRI NUCLEAR-COMPLEXES/

The novel (E,E)-dioxime rown-5)-2,3-bis(hydroxyimino)-7,12-dioxo-1,4,8 ,11- tetraazacyclotetradecane (H(2)L) has been synthesized by the reac tion of 4',5'-diaminobenzo(15-crown-5) with N,N'-bis(2-carbomethoxyphe nyl)diaminoglyoxime (1). Only mononuclear Co-III and Ru-II complexes w ith a metal/ligand ratio of 1:2 have been isolated. The cobalt(III) co mplex bridged with BF2+ is achieved with H-bonded cobalt(III) complex and borontrifluoride ethyl ether complex. The reaction of BF2 bridged cobalt(III) complex with bis(benzonitril)palladium(II) chloride gives a trinuclear complex. The structures of dioxime and its complexes are proposed according to elemental analyses, H-1 and C-13-NMR, IR and mas s spectral data.