Solid-state and solution characterizations of [(TMPA)Cu(II)(SO3)] and [(TMPA)Cu(II)(S2O3)] complexes: Application to
Léonie Berthonnaud1, Charlène Esmieu2, Sonia Mallet-Ladeira2
1LCC-CNRS, Université de Toulouse, CNRS, Toulouse, France; Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, Japan.
Journal of Inorganic Biochemistry
|October 1, 2021
Summary
This study introduces a novel copper(II) complex for detecting low levels of sulfite and thiosulfate ions. The method was successfully applied to quantify sulfite in commercial crystal sugar.
Area of Science:
- Analytical Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Sulfite (SO32-) and thiosulfate (S2O32-) are industrially significant anions.
- Accurate detection of these anions is crucial in various applications, including food preservation and chemical processing.
Purpose of the Study:
- To develop a sensitive method for detecting low concentrations of sulfite and thiosulfate ions.
- To characterize the copper(II) complex with Tris-Methyl Pyridine Amine (TMPA) ligand and its interactions with target anions.
Main Methods:
- Synthesis and characterization of copper(II)-TMPA complexes.
- Spectroscopic techniques (UV-Vis, EPR) and cyclic voltammetry for monitoring complex formation.
- Single-crystal X-ray diffraction for structural elucidation.
- Stability studies across a pH range and determination of anion binding affinities.
Main Results:
- Formation of stable [LCu(SO3)] and [LCu(S2O3)] complexes was confirmed.
- Solid-state structures of the complexes were determined.
- The parent complex [LCu(solvent)]2+ exhibited significant binding affinity for the target anions.
- Sulfite content in commercial crystal sugar was successfully quantified.
Conclusions:
- The developed copper(II)-TMPA complex serves as an effective sensor for sulfite and thiosulfate ions.
- The methodology offers a reliable approach for anion detection in real-world samples.
- This research contributes to the advancement of analytical techniques for important industrial anions.
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