Complex formation between some metals and a quinolone family member (ciprofloxacin)

Iztok Turel, Nataša Bukovec, Etelka Farkas

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Some metal [Ca(II), Co(II), Ni(II), Cu(II), Zn(II), Al(III) and Fe(III)] complexes of the quinolone family member (ciprofloxacin = cf) were studied by potentiometric and spectroscopic methods in solution. The results of EPR and polarographic methods are also included. The titration curves for the metal ion-ciprofloxacin were evaluated by assuming all possible models. It was found that a lot of protonated complexes are formed before precipitation in the systems studied. The UV-vis results in the Cu(II)-Cf system showed that in the more acidic region a 1:1 complex is favoured, whereas a 1:2 complex prevailed at higher pH values. The coordination of the second ligand is somewhat more favoured than that of the first ligand, and it seems probable that the 1:1 complex is more distorted. Some ternary complexes (Cu(II)-cf-2.2′-bipyridyl, -glycine and -tyrosine] were studied as well. From the ΔlogK value, it was deduced that the formation of the mixed ligand complex in the system Cu(II)-cf-2.2′-bipyridyl is favoured due to back-coordination.

Original languageEnglish
Pages (from-to)269-275
Number of pages7
Issue number2
Publication statusPublished - Jan 1996


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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