Authors :
Gongden J. J; Usman N. U; Uduah V; Lohdip Y.N; Solomon L.D
Volume/Issue :
Volume 7 - 2022, Issue 12 - December
Google Scholar :
https://bit.ly/3IIfn9N
Scribd :
https://bit.ly/40d2ONI
DOI :
https://doi.org/10.5281/zenodo.7568545
Abstract :
Mixed ligands/Coordinate complexes are still
largely investigated. This is because of their very wide
range of uses and applications.The mixed ligand
complexes of Co (II) and Ni (II) with hippuric acid,
ammonium thiocyanate and hydroxyl ammonium
chloride were synthesized in a 1:2:2:2 stoichiometric
ratio by a modified direct combination method. The
resulting complexes were characterized by preliminary
tests and spectroscopic methods. The physicochemical
parameters such as melting point, boiling point, pH,
electrical conductivity and colour of the complexes were
determined. The solubility in water, ethanol, and
methanol were also studied at 25oC. The
characterization of the prepared mixed-ligand complexes
was done using FT-IR, UV-VIS, XRD, crystallography
and XRF spectroscopic methods. The percentage yield
obtained were 42.90% and 40.70% Co (II) and Ni(II)
complexes respectively. Both complexes were soluble in
methanol, but slightly soluble in water and ethanol at
25oC.This implies that the ionic complexes formed are
generally polar, since they are quite soluble in polar
solvents such as water, ethanol and methanol. The
complexes were acidic with pH values of 3.24 and 3.30
for Co(II) and Ni(II) respectively. The melting and
boiling points of the complexes were (190 and 206)oC and
(50 and 80.2)oC for Co(II) and Ni(II) respectively. The
low melting and boiling points of the synthesized
complexes may be due to the nature of the bond in the
complexes since they are not completely ionic and
possibly the properties of the central metals. The
electrical conductivities were found to be (1.2 x 10-1
and
1.1 x 10-1
) ᶙs/cm for Co(II) and Ni(II) complexes. This
indicates that the complexes are non-electrolytes.
Elemental analysis corresponds to metal: ligand
stoichiometry for Co (II) and Ni II) complexes are
Keywords :
Co (II) and Ni (II) complexes; Synthesis; Characterization; Crystallography; spectroscopy;Mixed ligands.
Mixed ligands/Coordinate complexes are still
largely investigated. This is because of their very wide
range of uses and applications.The mixed ligand
complexes of Co (II) and Ni (II) with hippuric acid,
ammonium thiocyanate and hydroxyl ammonium
chloride were synthesized in a 1:2:2:2 stoichiometric
ratio by a modified direct combination method. The
resulting complexes were characterized by preliminary
tests and spectroscopic methods. The physicochemical
parameters such as melting point, boiling point, pH,
electrical conductivity and colour of the complexes were
determined. The solubility in water, ethanol, and
methanol were also studied at 25oC. The
characterization of the prepared mixed-ligand complexes
was done using FT-IR, UV-VIS, XRD, crystallography
and XRF spectroscopic methods. The percentage yield
obtained were 42.90% and 40.70% Co (II) and Ni(II)
complexes respectively. Both complexes were soluble in
methanol, but slightly soluble in water and ethanol at
25oC.This implies that the ionic complexes formed are
generally polar, since they are quite soluble in polar
solvents such as water, ethanol and methanol. The
complexes were acidic with pH values of 3.24 and 3.30
for Co(II) and Ni(II) respectively. The melting and
boiling points of the complexes were (190 and 206)oC and
(50 and 80.2)oC for Co(II) and Ni(II) respectively. The
low melting and boiling points of the synthesized
complexes may be due to the nature of the bond in the
complexes since they are not completely ionic and
possibly the properties of the central metals. The
electrical conductivities were found to be (1.2 x 10-1
and
1.1 x 10-1
) ᶙs/cm for Co(II) and Ni(II) complexes. This
indicates that the complexes are non-electrolytes.
Elemental analysis corresponds to metal: ligand
stoichiometry for Co (II) and Ni II) complexes are
Keywords :
Co (II) and Ni (II) complexes; Synthesis; Characterization; Crystallography; spectroscopy;Mixed ligands.
