ESR and pH-potentiometric study of the mixed-ligand complex formation in the copper(II)-4-fluorosalicylic acid-N,N-diethylnicotinamide system: Structure and spectral properties of [Cu(4-fluorosalicylate)2(N,N- diethylnicotinamide)2(H2O)2] complex

T. Szabó-Plánka, Ján Moncol, Eszter Tóth, B. Gyurcsik, N. Nagy, Zuzana Vasková, A. Rockenbauer, Dušan Valigura

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Abstract

EPR simulation method together with pH-potentiometry combined with UV-Vis spectrophotometry were used for the study of the ternary system 4-fuorosalicylic acid (HA)-N,N-diethylnicotinamide (B)-copper(II) in aqueous solution. The N,N-diethylnicotinamide ligand is a weak donor, its mixed-ligand complexes with 4-fluorosalicylate anions are more favoured. The number of coordinated N,N-diethylnicotinamide molecules increases with decreasing temperature: up to four ones were detected in the coordination sphere of copper(II) in frozen solutions. The formation of [CuH-1AB2] and [CuH -1A] was detected by all methods at neutral pH. At lower pH values, [CuA2B2] and [CuB] become dominant, and this fact is in good agreement with [CuA2B2(H2O)2] crystals obtained from similar solutions. The structural unit of the [CuA 2B2(H2O)2] complex consists of a copper(II) ion, which is monodentately coordinated by a pair of 4-fluorosalicylate anions and by a pair of N,N-diethylnicotinamide in trans positions in the basal plane, and by two water molecules in the axial positions of a tetragonal bipyramid.

Original languageEnglish
Pages (from-to)2421-2429
Number of pages9
JournalPolyhedron
Volume30
Issue number14
DOIs
Publication statusPublished - Aug 30 2011

Fingerprint

Paramagnetic resonance
Copper
Ligands
copper
ligands
acids
Acids
Anions
Negative ions
anions
potentiometric analysis
Molecules
Spectrophotometry
Ternary systems
spectrophotometry
ternary systems
molecules
Ions
aqueous solutions
Crystals

Keywords

  • 4-Fluorosalicylic acid
  • Copper(II) complexes
  • Crystal structure
  • Electron spin resonance
  • N,N-Diethylnicotinamide
  • pH-potentiometry
  • Speciation

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Materials Chemistry
  • Physical and Theoretical Chemistry

Cite this

@article{e41e4e7563354a438172dcf82f41b7dd,
title = "ESR and pH-potentiometric study of the mixed-ligand complex formation in the copper(II)-4-fluorosalicylic acid-N,N-diethylnicotinamide system: Structure and spectral properties of [Cu(4-fluorosalicylate)2(N,N- diethylnicotinamide)2(H2O)2] complex",
abstract = "EPR simulation method together with pH-potentiometry combined with UV-Vis spectrophotometry were used for the study of the ternary system 4-fuorosalicylic acid (HA)-N,N-diethylnicotinamide (B)-copper(II) in aqueous solution. The N,N-diethylnicotinamide ligand is a weak donor, its mixed-ligand complexes with 4-fluorosalicylate anions are more favoured. The number of coordinated N,N-diethylnicotinamide molecules increases with decreasing temperature: up to four ones were detected in the coordination sphere of copper(II) in frozen solutions. The formation of [CuH-1AB2] and [CuH -1A] was detected by all methods at neutral pH. At lower pH values, [CuA2B2] and [CuB] become dominant, and this fact is in good agreement with [CuA2B2(H2O)2] crystals obtained from similar solutions. The structural unit of the [CuA 2B2(H2O)2] complex consists of a copper(II) ion, which is monodentately coordinated by a pair of 4-fluorosalicylate anions and by a pair of N,N-diethylnicotinamide in trans positions in the basal plane, and by two water molecules in the axial positions of a tetragonal bipyramid.",
keywords = "4-Fluorosalicylic acid, Copper(II) complexes, Crystal structure, Electron spin resonance, N,N-Diethylnicotinamide, pH-potentiometry, Speciation",
author = "T. Szab{\'o}-Pl{\'a}nka and J{\'a}n Moncol and Eszter T{\'o}th and B. Gyurcsik and N. Nagy and Zuzana Vaskov{\'a} and A. Rockenbauer and Dušan Valigura",
year = "2011",
month = "8",
day = "30",
doi = "10.1016/j.poly.2011.06.030",
language = "English",
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pages = "2421--2429",
journal = "Polyhedron",
issn = "0277-5387",
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TY - JOUR

T1 - ESR and pH-potentiometric study of the mixed-ligand complex formation in the copper(II)-4-fluorosalicylic acid-N,N-diethylnicotinamide system

T2 - Structure and spectral properties of [Cu(4-fluorosalicylate)2(N,N- diethylnicotinamide)2(H2O)2] complex

AU - Szabó-Plánka, T.

AU - Moncol, Ján

AU - Tóth, Eszter

AU - Gyurcsik, B.

AU - Nagy, N.

AU - Vasková, Zuzana

AU - Rockenbauer, A.

AU - Valigura, Dušan

PY - 2011/8/30

Y1 - 2011/8/30

N2 - EPR simulation method together with pH-potentiometry combined with UV-Vis spectrophotometry were used for the study of the ternary system 4-fuorosalicylic acid (HA)-N,N-diethylnicotinamide (B)-copper(II) in aqueous solution. The N,N-diethylnicotinamide ligand is a weak donor, its mixed-ligand complexes with 4-fluorosalicylate anions are more favoured. The number of coordinated N,N-diethylnicotinamide molecules increases with decreasing temperature: up to four ones were detected in the coordination sphere of copper(II) in frozen solutions. The formation of [CuH-1AB2] and [CuH -1A] was detected by all methods at neutral pH. At lower pH values, [CuA2B2] and [CuB] become dominant, and this fact is in good agreement with [CuA2B2(H2O)2] crystals obtained from similar solutions. The structural unit of the [CuA 2B2(H2O)2] complex consists of a copper(II) ion, which is monodentately coordinated by a pair of 4-fluorosalicylate anions and by a pair of N,N-diethylnicotinamide in trans positions in the basal plane, and by two water molecules in the axial positions of a tetragonal bipyramid.

AB - EPR simulation method together with pH-potentiometry combined with UV-Vis spectrophotometry were used for the study of the ternary system 4-fuorosalicylic acid (HA)-N,N-diethylnicotinamide (B)-copper(II) in aqueous solution. The N,N-diethylnicotinamide ligand is a weak donor, its mixed-ligand complexes with 4-fluorosalicylate anions are more favoured. The number of coordinated N,N-diethylnicotinamide molecules increases with decreasing temperature: up to four ones were detected in the coordination sphere of copper(II) in frozen solutions. The formation of [CuH-1AB2] and [CuH -1A] was detected by all methods at neutral pH. At lower pH values, [CuA2B2] and [CuB] become dominant, and this fact is in good agreement with [CuA2B2(H2O)2] crystals obtained from similar solutions. The structural unit of the [CuA 2B2(H2O)2] complex consists of a copper(II) ion, which is monodentately coordinated by a pair of 4-fluorosalicylate anions and by a pair of N,N-diethylnicotinamide in trans positions in the basal plane, and by two water molecules in the axial positions of a tetragonal bipyramid.

KW - 4-Fluorosalicylic acid

KW - Copper(II) complexes

KW - Crystal structure

KW - Electron spin resonance

KW - N,N-Diethylnicotinamide

KW - pH-potentiometry

KW - Speciation

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U2 - 10.1016/j.poly.2011.06.030

DO - 10.1016/j.poly.2011.06.030

M3 - Article

AN - SCOPUS:80051664072

VL - 30

SP - 2421

EP - 2429

JO - Polyhedron

JF - Polyhedron

SN - 0277-5387

IS - 14

ER -