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EPR Study of 5-Chlorosalicylate-Cu(II)-N,N-Diethylnicotinamide Ternary Complex Systems in Frozen Water–Methanol Solutions

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Abstract

As a continuation of our previous study of Cu(II) ternary complexes, two new systems containing 5-chlorosalicylic acid (5-ClsalH) and different Cu(II) salts, with varying N,N-diethylnicotinamide (denia) concentrations, system III [CuSO4(aq) + 2(5-ClsalH(solv)) + xdenia(l)] and system IV [Cu(ac)2(aq) + 2(5-ClsalH(solv)) + xdenia(l)], where x = 0, 2, 4, 6 and 8, were prepared. The effects of Cu(II) salts containing anions of different basicity and N-donor ligand (denia) with varying ligand-to-metal ratio (x) on the formation of resulting complexes were studied by electron paramagnetic resonance (EPR) spectroscopy in frozen water–methanol solutions. Well-resolved 14N superhyperfine splitting lines (nonet) in the perpendicular region of the second-derivative axially symmetric Cu(II) EPR spectra indicated that for x > 4 in system III and for x ≥ 2 in system IV, four equivalent nitrogens could be coordinated to the central Cu(II) ions in the equatorial plane. Such information cannot be obtained by EPR spectroscopy of powder samples of the given Cu(II) complex systems. The differences between denia and ronicol containing Cu(II) complexes are discussed.

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Acknowledgments

We are grateful to Prof. Joshua Telser (Roosevelt University, Chicago, IL, USA) for fruitful discussions. This work was supported by Science and Technology Assistance Agency under the contact No. APVV-0055-07 and by Slovak Grant Agency for Science (VEGA 1/0018/09, 1/0353/08 and 1/0856/11).

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Authors and Affiliations

  1. Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37, Bratislava, Slovak Republic

    L. Martiška, L. Husáriková, Z. Repická, D. Valigura, M. Valko & M. Mazúr

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  1. L. Martiška
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  2. L. Husáriková
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  3. Z. Repická
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  4. D. Valigura
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  5. M. Valko
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  6. M. Mazúr
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Correspondence to M. Mazúr.

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Martiška, L., Husáriková, L., Repická, Z. et al. EPR Study of 5-Chlorosalicylate-Cu(II)-N,N-Diethylnicotinamide Ternary Complex Systems in Frozen Water–Methanol Solutions. Appl Magn Reson 40, 405–411 (2011). https://doi.org/10.1007/s00723-011-0223-7

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  • DOI: https://doi.org/10.1007/s00723-011-0223-7

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