SYNTHESIS AND CHARACTERIZATION OF COPPER(II), COBALT(II), NICKEL(II),IRON(II) AND OXOVANADIUM(IV) CHELATES OF A NEW PAIR OF SCHIFF-BASE LIGANDS DERIVED FROM 1,3-BIS(AMINOMETHYL)CYCLOHEXANE

A few complexes of Cu(ET), Co(II), Ni(II), Ee(II) and oxovanadium (TV) ions of a pair of Schiff base ligands, BAMC-Sal and BAMC-Pyrog, deriv ed from 1, 3-bis(aminomethyl)cyclohexane and either salicylaldehyde or pyrogallaldehyde have been synthesised and characterised by elemental analysis, spectral and magnetic studies. The studies indicate that co pper(II) complexes stack as dimers in solid state with a square-pyrami dal geometry around the metal centres which upon dissolution monomeris e to give pseudo-tetrahedral geometry. The cobalt(II) halides give a t rinuclear (CoL)(2)CoX(2) structure with mixed spin states where LH(2) is the ligand and X a non-bridging halide ligand on the central cobalt (II) ion. Other cobalt(II) salts, besides, nickel(II), iron(II) and ox ovanadium(IV) ions give monomeric ML type complexes with octahedral fo r Co(II), tetrahedral for Ni(II) and Fe(II) and square-pyramidal geome tries for VO(II) metal ions.