Synthesis, Structural Characterization and Chromotropism of a Ni(II) and a Co(II) Compound with Acesulfamate as a Ligand |
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Authors: | Hasan Icbudak Elif Adiyaman Naziye Cetin Ahmet Bulut Orhan Buyukgungor |
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Institution: | (1) Department of Chemistry, Faculty of Arts and Sciences, Ondokuz Mayıs University, 55139 Kurupelit, Samsun, Turkey;(2) Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, 55139 Kurupelit, Samsun, Turkey |
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Abstract: | The novel bis(acesulfamato-O)tetraaquanickel(II) and bis(acesulfamato-N)tetraaquacobalt(II) complexes have been synthesized
and characterized by elemental analyses, magnetic measurements, u.v.–vis and FT-IR spectra. The thermal behavior of the complexes
was also studied by simultaneous TG, DTG and DTA methods in a static air atmosphere. The crystal structure of bis(acesulfamato-O)tetraaquanickel(II)
complex has been identified by single-crystal X-ray diffraction analyses. The acesulfamate ligand (acs) acts as an O-donor
through the carbonyl oxygen as a monodentate ligand in the Ni(II) complex. The Ni(II) ion structure resides on a two-fold
axis and is coordinated by four aqua ligands defining the basal plane, and by two monodentate acesulfamate ligands occupying
the axial positions. The chromotropism of both complexes has been studied using thermal and spectral analysis. The bis(acesulfamato-N)tetraaquacobalt(II)complex
is found to be very soluble in water and organic solvents and exhibits a reversible thermochromism from pink to violet depending
on deaquation, which occurs in two steps, in the solid state. The bis(acesulfamato-O)tetraaquanickel(II) complex has shown
two thermochromic properties one of which is a reversible and changes the color from green to yellow by an endothermic effect,
whereas the other one is irreversible and changes from yellow to brown depending on deaquation, in the solid state. The bis(acesulfamato-N)tetraaquacobalt(II)
complex exhibits solvatochromism in solvents with different donor number and ionochromism in the presence of various cations
in solution. |
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