Geometrical structures, thermal stability and antimicrobial activity of Schiff base supramolecular and its metal complexes
By A.Z. El-Sonbati and M.A. Diab and A.A. El-Bindary and G.G. Mohamed and Sh.M. Morgan and M.I. Abou-Dobara and S.G. Nozha
Published in Journal of Molecular Liquids
2016
Abstract
The 1:1 condensation of 4-amino-1-phenyl-2,3-dimethylpyrazoline-5-one and 8-hydroxy-7-formylquinoline under template condition to obtain the Schiff base ligand 4-(8-hydroxyquinoline-7-yl)methyleneamino-1,2-dihydro-1,5-dimethyl-2-phenylpyra-zol-3-one (HL) with \NO2\ donor set. Reaction of the ligand with metal salts gives a series of novel complexes. The ligand and its metal complexes were characterized by elemental analyses, IR, 1H and 13C NMR, electronic, ESR, X-ray diffraction and mass spectral, conductivity and magnetic susceptibility measurements as well as thermal analyses. The analytical and spectroscopic tools showed that the complexes can be formulated as: [Cu(L)2] (1), [CuLX] nH2O, where X = OAc, n = 2 (2); ONO2, n = 3 (3); NCS, n = 0 (4), [MHLX] nH2O, where M = Cu(II), X = OSO3, n = 5 (5); M = VO(II), X = O2SO2, n = 2H2O (6) and [UO2L(ONO2)(OH2)2].2H2O (7). The X-ray diffraction (XRD) patterns of start 1, start 2, Schiff base and complex [Cu(L)2] (1) are investigated in powder forms. The molecular and electronic structures of the ligand (HL) and its complexes have been discussed. It was found that form (A) is more stable than other forms (B and C). The \HL\ ligand acts as a monobasic tridentate \ONO\ donor for complexes (1