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

T. Szabó-Plánka, B. Gyurcsik, N. Nagy, A. Rockenbauer, Rastislav Šípoš, Jozef Šima, Milan Melník

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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
Volume102
Issue number1
DOIs
Publication statusPublished - Jan 2008

Fingerprint

Electron Spin Resonance Spectroscopy
Complexation
Paramagnetic resonance
Copper
Potentiometry
Water
Spectrophotometry
Methanol
Ligands
Isomers
Dimers
5-fluorosalicylic acid

Keywords

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

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry

Cite this

@article{766a150e1675496096a96ac0c5e6d57f,
title = "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",
abstract = "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.",
keywords = "Coordination modes, Copper(II) complexes of 5-fluorosalicylic acid, Electron spin resonance, Speciation",
author = "T. Szab{\'o}-Pl{\'a}nka and B. Gyurcsik and N. Nagy and A. Rockenbauer and Rastislav Š{\'i}poš and Jozef Šima and Milan Meln{\'i}k",
year = "2008",
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language = "English",
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T2 - A pH-potentiometric, UV-vis spectroscopic, and electron spin resonance study by the two-dimensional simulation of spectra

AU - Szabó-Plánka, T.

AU - Gyurcsik, B.

AU - Nagy, N.

AU - Rockenbauer, A.

AU - Šípoš, Rastislav

AU - Šima, Jozef

AU - Melník, Milan

PY - 2008/1

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N2 - 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.

AB - 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.

KW - Coordination modes

KW - Copper(II) complexes of 5-fluorosalicylic acid

KW - Electron spin resonance

KW - Speciation

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