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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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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:
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A ternary Fe(ii)-terpyridyl complex-based single platform for reversible multiple-ion recognition.

Alok Kumar Singh1, Gajanan Pandey, Kaman Singh

  • 1Department of Chemistry, Babasaheb Bhimrao Ambedkar University, Lucknow, India. aloksinghchemistry@gmail.com.

Dalton Transactions (Cambridge, England : 2003)
|April 25, 2018
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Summary

This study presents a novel iron(II)-terpyridyl complex for detecting cyanide, fluoride, and hydroxide ions in water. The complex shows reversible color changes and can be reused after detecting various metal cations.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Analytical Chemistry

Background:

  • Terpyridyl complexes are versatile ligands in coordination chemistry.
  • Developing selective and sensitive sensors for anions and cations is crucial for environmental and biological monitoring.
  • Iron(II) complexes offer tunable electronic and optical properties for sensing applications.

Purpose of the Study:

  • To develop a multi-ion recognition system using a ternary Fe(II)-terpyridyl complex.
  • To investigate the sensing capabilities for cyanide, fluoride, and hydroxide ions in aqueous media.
  • To explore the complex's potential for cation detection and sensor recyclability.

Main Methods:

  • Synthesis and characterization of the ternary Fe(II)-terpyridyl complex [Fe(PhT)(PT)]2+.
  • Spectroscopic (UV-Vis, fluorescence) and colorimetric analysis for ion detection.
  • Crystal structure determination of the complex with cyanide ions.
  • Computational studies to correlate structural and spectral changes.
  • Investigating cation-induced dissociation and sensor regeneration.

Main Results:

  • The complex demonstrated sensitive, selective, and rapid detection of cyanide, fluoride, and hydroxide ions.
  • Reversible color changes were observed, allowing for "by-eye" visualization.
  • Crystal structure confirmed the binding of three cyanide ions, displacing the PT ligand.
  • Multivariate interactions were observed for fluoride and hydroxide ions.
  • The complex successfully recognized and decoupled various cations (Ag+, Hg2+, Fe2+, Fe3+), enabling at least five reuse cycles.

Conclusions:

  • The developed Fe(II)-terpyridyl complex serves as an effective dual optical sensor for multiple anions and cations.
  • The reversible nature and recyclability of the sensor are advantageous for practical applications.
  • The study highlights the potential of rationally designed coordination complexes in advanced sensing technologies.