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 = benzoylhydra zine (BH) , p-hydroxybenzoylhydrazine (PHBH) salicyloylhydrazine (SH), isonicotinoylhydrazine (INH), anthraniloylhydrazine (AH) and their is opropanone derivatives viz., isopropanone benzoylhydrazone (IBH), -sal icyloylhydrazone (ISH), -anthraniloylhydrazone (IAH), and -isonicotino ylhydrazone (IINH) have been synthesized and characterized with the he lp of elemental analyses, electronic and IR spectra and magnetic momen t data. Electronic spectral bands and mu(eff) values suggest a distort ed octahedral environment around copper(II). SCN groups act as bridge between two metal centres while all the ligands are bi-coordinately bo nded 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 o f all the complexes except for CuAg2(SCN)4.SH. where an axial nature o f copper(II) is observed. Presence of half field signal in CuAg2(SCN)4 .PHBH complex suggests its dimeric nature. Powder X-ray diffraction st udies for CuAg2(SCN)4 and CuAg2(SCN)4.IBH suggest the presence of orth orhombic and tetragonal crystal lattice respectively.