E.S.R. STUDIES ON ACYLHYDRAZINE AND HYDRAZONE COPPER(II) SULFATE COMPLEXES

Cu-II complexes of the [CuL(2)(SO4)]. nH(2)O and [CuL'(SO4)(H2O)(2)]. nH(2)O type, where L = benzoylhydrazine (PhCONHNH(2); BH) or iso-propa none benzoylhydrazone (PhCONHN:CMe(2); IBH), L'=iso-nicotinoylhydrazin e (NC5H4CONHNH2; INH) or isopropanone iso-nicotinoylhydrazone (NC5H4CO NHN: CMe(2); IINH); n = 0-2, were prepared and characterized by elemen tal analyses, molar conductances, and electronic, e.s.r. and i.r. spec tral measurements. The electronic and e.s.r. spectra suggest a tetrago nally distorted octahedral geometry in the solid state as well as in D MSO solution. The e.s.r. data also reveal an axial symmetry for most o f the complexes in the solid state and in DMSO solution at 300 and 77 K, while the complex of IBH is isotropic at 300 K. The Delta M(s) = 2 transition observed for this complex suggests that it is a dimer. BH a nd INH bond to Cu-II through the C=O and NH2 groups, whereas IBH and I INH bond through C=O and C=N groups.