Abstract
The method of ESR is widely used for the investigation of electronic construction and the geometrical structure of the polynuclear complexes of the transition metals. The majority of the well-known experimental works had been done using monocrystals and polycrystalline examples. Construction of mononuclear complexes of the copper(II), the nature of antiferromagnetic exchange interaction, and its value was the object of the discussion by the scientists and that issue is being checked in the article. Complex compounds of copper(II) with 5,5-dimethyl-2,4-dioxohexane acid ((H<sub>2</sub>L<sup>1</sup>–H<sub>2</sub>L<sup>11</sup>) methyl ether aroylhydrazones were synthesized and studied. The interaction of alcohol solutions of the H<sub>2</sub>L<sup>1</sup>–H<sub>2</sub>L<sup>11</sup> ligands with an aqueous ammonia solution of copper(II) acetate synthesized green fine-crystalline copper(II) complexes. Complexes investigation by the method of ESR spectroscopy, of the studying the magneto chemical properties of copper(II) complexes. If for the complex compound CuL<sup>1</sup> • NH<sub>3</sub>, which has a cyclopentanone ring β-diketone fragment, the EPR parameters have theβa substituent for the α<sup>2</sup>=0.82; value: g=2.099, a<sub>Cu</sub>=89.53 e, a<sub>N</sub>=12.81 e, then for CuL<sup>4</sup> • NH<sub>3</sub> with a cyclohexane ring substituent these values are in the range: g=2,101, a<sub>Cu</sub>=87,48 e, a<sub>N</sub>=13,02 e, α<sup>2</sup>=0,82.
Highlights
In recent years, research in the field of coordination chemistry has been characterized by a stable tendency to shift the center of gravity from simple mononuclear compounds to more complex systems, which is primarily due to the search for new molecular materials and catalytic systems
They can be obtained by reacting an aqueous solution of copper(II) chloride– CuCl2⋅2H2O with an alcohol solution of the ligand with the subsequent addition of a dilute aqueous solution of ammonia or by mixing alcohol solutions of copper(II) acetate and the ligand
Experimental spectra were transmitted via a special interface to the SM-4 computer, which was used for theoretical reconstruction of ESR spectra
Summary
Research in the field of coordination chemistry has been characterized by a stable tendency to shift the center of gravity from simple mononuclear compounds to more complex systems, which is primarily due to the search for new molecular materials and catalytic systems. In contrast to Ni(II), the IR spectra of Cu(II) complexes similar in composition do not change noticeably when the complexes are dissolved in CCl4. They can be obtained by reacting an aqueous solution of copper(II) chloride– CuCl2⋅2H2O with an alcohol solution of the ligand with the subsequent addition of a dilute aqueous solution of ammonia or by mixing alcohol solutions of copper(II) acetate and the ligand. When the complex is formed due to nitrogen of the enhydrazine form, the bands of valence vibrations of this bond must show
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