ESR spectra of copper(ii) complexes with 2-hydroxy-5-methyl- and 5-chloro-2-hydroxyacetophenone acyldihydrazones |
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Authors: | V F Shul'gin A N Gusev V Ya Zub G M Larin |
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Institution: | (1) V. I. Vernadsky Tavrida National University, 4 ul. Yaltinskaya, 95007 Simferopol, Ukraine;(2) Taras Shevchenko Kiev National University, 60 ul. Vladimirskaya, 01033 Kiev, Ukraine;(3) N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 119991 Moscow, Russian Federation |
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Abstract: | ESR spectra of binuclear copper(ii) complexes with 2-hydroxy-5-methyl- and 5-chloro-2-hydroxyacetophenone acyldihydrazones (H4L) Cu2L·2Py], in which the coordination polyhedra are linked by the polymethylene chain with different lengths (from one to five units), were studied. The spectra of the complexes based on acyldihydrazones of malonic, succinic, glutaric, and adipic acids exhibit weak exchange interactions between the paramagnetic sites. These interactions induce seven HFS lines from two equivalent copper nuclei with the constant 40·10–4 cm–1 in the ESR spectra of liquid solutions. An increase in the polymethylene chain length to five units prevents the exchange interactions, and the ESR spectrum of the complex based on heptadioic acyldihydrazone contains the signal of four HFS lines with the constant 72·10–4 cm–1, which is common for the copper(ii) monomeric compounds. |
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Keywords: | 2-hydroxyacetophenone acyldihydrazones copper(ii) binuclear complexes hyperfine structure spin-spin exchange interactions ESR spectroscopy |
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