Complexation of 5-fluorosalicylic acid with copper(II): A pH-potentiometric, UV-vis spectroscopic, and electron spin resonance study by the two-dimensional simulation of spectra

Terézia Szabó-Plánka, Béla Gyurcsik, Nóra Veronika Nagy, Antal Rockenbauer, Rastislav Šípoš, Jozef Šima, Milan Melník

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The copper(II)-5-fluorosalicylic acid system was investigated in water and 50 v/v% water-methanol mixture by pH potentiometry combined with UV-vis spectrophotometry, and by the two-dimensional ESR simulation method, respectively. The data revealed that the stable paramagnetic mono- and bis(salicylato) copper(II) complexes [CuLH-1] and [CuL2H-2]2- are formed, and at low excess of ligand, the ESR-silent mixed hydroxo complex [Cu2L2H-3]- is also a major species. By the two-dimensional ESR simulation method, the species [CuL]+ in the acidic region, and the minor dimer [Cu2L2H-2] were also identified, and the cis and trans isomers of [CuL2H-2]2- were characterized. In frozen solutions, the ESR analysis revealed a slight rhombic distortion of coordination polyhedra for the latter three species.

Original languageEnglish
Pages (from-to)101-109
Number of pages9
JournalJournal of Inorganic Biochemistry
Issue number1
Publication statusPublished - Jan 1 2008



  • Coordination modes
  • Copper(II) complexes of 5-fluorosalicylic acid
  • Electron spin resonance
  • Speciation

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry

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