SYNTHESIS, CHARACTERIZATION, SPECTRAL, MAGNETIC, XRD AND ESR STUDIES ON SOME NOVEL TRINUCLEAR COPPER(II) TETRATHIOCYANATO-DIARGENTATE(I) COMPLEXES WITH ACYL HYDRAZINE AND HYDRAZONE BASES

Copper(II) complexes of the type CuAg2(SCN)4.L (where L = benzoylhydrazine (BH) , p-hydroxybenzoylhydrazine (PHBH) salicyloylhydrazine (SH), isonicotinoylhydrazine (INH), anthraniloylhydrazine (AH) and their isopropanone derivatives viz., isopropanone benzoylhydrazone (IBH), -salicyloylhydrazone (ISH), -anthraniloylhydrazone (IAH), and -isonicotinoylhydrazone (IINH) have been synthesized and characterized with the help of elemental analyses, electronic and IR spectra and magnetic moment data. Electronic spectral bands and mu(eff) values suggest a distorted octahedral environment around copper(II). SCN groups act as bridge between two metal centres while all the ligands are bi-coordinately bonded through >C=O and -NH2 or >C-N-groups, except in CuAg2(SCN)4.L (L=INH and IINH) where the ligands are coordinated through -NH2/-N=C< and pyridyl ring nitrogenS. Powder ESR data suggest an isotropic nature of all the complexes except for CuAg2(SCN)4.SH. where an axial nature of copper(II) is observed. Presence of half field signal in CuAg2(SCN)4.PHBH complex suggests its dimeric nature. Powder X-ray diffraction studies for CuAg2(SCN)4 and CuAg2(SCN)4.IBH suggest the presence of orthorhombic and tetragonal crystal lattice respectively.