Synthetic, spectroscopic and thermal studies of some complexes of unsymmetrical Schiff base ligand

摘要: New unsymmetrical Schiff base ligand (H2L) is prepared via condensation of 2-hydroxy-5-methyl acetophenone, 2-hydroxy-5-chloro-3-nitro acetophenone and carbohydrazide in 1:1:1 ratio. Metal complexes VO(IV), Cr(III), Mn(III), Fe(III), Zr(IV), MoO2(VI), WO2(VI) UO2(VI) have been prepared. These were characterized by elemental analysis, UV–Vis IR spectroscopy magnetic moment thermogravimetric analysis. The purity the metal confirmed microanalyses, while nature was further corroborated 1H NMR. All are air stable insoluble water common organic solvents but fairly soluble DMSO. analysis shows 1:1 to stoichiometry for all complexes. Thermal behaviour studied, found be quite their thermal decomposition generally partially loss moiety ended with respective oxide as a final product. Comparison spectrum its confirm that behave dibasic tetradentate towards central ion an ONNO donor sequence. dc electrical conductivity studied data obtained obeyed relation σ = 0 exp(−E a/kT) over temperature range 40–130 °C. X-ray diffraction study VO(IV) complex crystalline triclinic crystal system.