Author(s): Sanaa M. Emam, Saeyda A. Abouel-enein, Eman Monir
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 6 - Issue. 09 , September - 2017
A new series of divalent metal complexes of Co(II), Ni(II), Cu(II) and Cd(II) have been prepared with (H4L) azo ligand derived from coupling of MDA with barbituric acid affording half unit (L:M), sandwich (2L:2M) and binuclear (1L:2M) complexes. The elemental analyses, spectral methods (IR, UV-visible, 1H NMR and ESR), magnetic moments and thermal studies were used to support the mode of bonding and geometrical structure for the ligand and its metal complexes. The IR spectral data showed that H4L ligand binds with some metal ions in keto-enol form. The ligand behaves as a neutral bidentate moiety in Co(II) and Cu(II) complexes, while, it acts as a neutral tetradentate fashion in Ni(II) and Cd(II) chelates. The spectra revealed that azo group participates in chelation in all complexes in addition to oxygen atom of enol form or carbonyl group. The absorption data established an octahedral structure for Co(II), Cd(II) complexes, whereas, square pyramidal and square planar geometries for Ni(II) and Cu(II) complexes, respectively. The molar conductance measurements proved non-electrolytic nature for all complexes. Thermogravimetric (TG) and derivative thermogravimetric (DTG) analyses revealed the presence of lattice EtOH in outer sphere in all complexes. The thermal decomposition of complexes occurs in two-three stages ended with the formation of metal as a final residue. ESR spectrum of Cu(II) complex demonstrates that the free electron is cited in (dx2-y2) orbital.
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