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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
41.6K
Qualitative Analysis03:46

Qualitative Analysis

22.3K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.8K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

514
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Solvation effect enabled visualized discrimination of multiple metal ions.

Yang Cheng1,2, Yuan Liu1, Jiguang Li1

  • 1Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China. liuyuan@ms.xjb.ac.cn.

Analytical Methods : Advancing Methods and Applications
|March 26, 2024
PubMed
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This study introduces a new method for detecting toxic metal ions in the environment using an optical probe. The solvation effect is key to distinguishing between copper (Cu(II)), zinc (Zn(II)), cadmium (Cd(II)), and aluminum (Al(III)) ions.

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Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Chemical Sensing

Background:

  • Environmental monitoring of toxic metal ions is crucial for human health and ecological balance.
  • Solvation effects significantly influence chemical reactions and photophysical properties, offering potential for ion detection.
  • Visualized detection of metal ions is a growing area of research.

Purpose of the Study:

  • To develop a sensing strategy for the visualized discrimination of four critical metal ions (Cu(II), Zn(II), Cd(II), Al(III)).
  • To investigate the influence of solvent properties on the complexation and emission of an optical probe.
  • To achieve highly efficient and selective detection of potentially toxic metal ions at low concentrations.

Main Methods:

  • Utilized 5-amino-1,10-phenanthroline (APT) as an optical probe.
  • Explored solvation effect-modulated complexation of APT with different metal ions.
  • Analyzed the impact of solvent polarity, free energy, and electrostatic potential on the sensing mechanism.
  • Systematically evaluated detection limits and recognition selectivity.

Main Results:

  • Achieved visualized discrimination of Cu(II), Zn(II), Cd(II), and Al(III) ions.
  • Demonstrated detection limits at the nanomolar (nM) level.
  • Exhibited good recognition selectivity for the target metal ions.
  • Clarified the role of solvent properties in modulating the sensing performance.

Conclusions:

  • A novel sensing strategy based on solvation effects for metal ion detection was successfully developed.
  • The strategy enables efficient and selective detection of multiple toxic metal ions.
  • A portable sensing chip was created, indicating potential for real-world applications.
  • This approach provides new insights into substance determination through solvation manipulation.