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Experimental study and computer modeling of Ni(II) and Cu(II) complexation with ceftazidime

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Abstract

The protonation constants of the anion of the cephalosporin antibiotic ceftazidime Ctzd– and formation constants of its complexes with Ni2+ and Cu2+ have been determined by pH metric titration at 25°С and ionic strength 0.1 (KNO3): logβ(HCtzd) = 4.82 ± 0.04, logβ(H2Ctzd+) = 7.62 ± 0.06, logβ(H3Ctzd2+) = 9.23 ± 0.09, logβ(NiCtzd+) = 4.04 ± 0.03, logβ(Ni(Ctzd)2) = 6.41 ± 0.06, and logβ(CuCtzd+) = 5.03 ± 0.06. The potentiometric method has failed to reveal the complexation of Ctzd– with Co2+, Zn2+, and Cd2+. The composition of the [Ni(Ctzd)2] and [CuCtzd]+ complexes has been confirmed by spectrophotometry. The computer models of the [NiCtzd]+ and [CuCtzd]+ complexes have been calculated by the DFT method with the use of the B3LYP hybrid functional and the LACV3P**++ basis set.

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Authors and Affiliations

  1. Tver State University, ul. Zhelyabova 33, Tver, 170100, Russia

    V. G. Alekseev & E. M. Sokolova

Authors
  1. V. G. Alekseev
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  2. E. M. Sokolova
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Correspondence to V. G. Alekseev.

Additional information

Original Russian Text © V.G. Alekseev, E.M. Sokolova, 2016, published in Zhurnal Neorganicheskoi Khimii, 2016, Vol. 61, No. 4, pp. 555–558.

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Alekseev, V.G., Sokolova, E.M. Experimental study and computer modeling of Ni(II) and Cu(II) complexation with ceftazidime. Russ. J. Inorg. Chem. 61, 531–534 (2016). https://doi.org/10.1134/S0036023616040021

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  • DOI: https://doi.org/10.1134/S0036023616040021

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