Spectroscopic studies on isomerisation of coordinated polyfunctional dihydrazone in going from monometallic to bimetallic complexes: Zinc(II), copper(II) and dioxouranium(VI) complexes of bis(2- hydroxy-1-naphthaldehyde )oxaloyldihydrazone

839-842The monometallic complexes of the type [Zn2(H4L)2 (SO4]2 (1), [Zn2(H2L)2(H2O2] (2), K2 [Zn2(H2L)2F2] (2a), and the heterobimetallic complexes of the type [(UO2)2Zn2(L)2(H2O)6] (3), K4 [(UO2) 2Zn2 (L)2F4(H2O)2] (3a), [Cu2Zn2(L)2H2O)4] (4) and K4[Cu2Zn2(L) 2F4(H2O) 2] (4a) have been synthesized and characterized by analytical, molar conductance, and magnetic data and electronic, EPR, IR and 1H NMR spectroscopic studies. Monometallic complexes have been shown to contain the coordinated dihydrazone in syn-cis-configuration while the heterobimetallic complexes contain the coordinated dihydrazone in the anti-cis-configuration