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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

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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Use of Autometallography to Localize and Semi-Quantify Silver in Cetacean Tissues
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Multiple evidence for gold(I)...silver(I) interactions in solution.

Eduardo J Fernández1, Christopher Hardacre, Antonio Laguna

  • 1Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, UA-CSIC, Complejo Científico-Tecnológico, 26004 Logroño, Spain.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 15, 2009
PubMed
Summary
This summary is machine-generated.

This study reveals that the unique 2D polymeric structure of the gold-silver complex [AuAg3(C6F5)(CF3CO2)3(CH2PPh3)]n persists in solution. Metallophilic interactions are maintained, influencing its photophysical properties.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Metallophilic interactions are crucial in designing novel materials with unique electronic and optical properties.
  • Gold-silver complexes offer a platform for exploring cooperative effects between different metal centers.

Purpose of the Study:

  • To synthesize and characterize a novel gold-silver cluster complex.
  • To investigate the structural stability and electronic properties of the complex in solid-state and solution.

Main Methods:

  • X-ray diffraction for crystal structure determination.
  • Extended X-ray absorption fine structure (EXAFS) spectroscopy.
  • Pulsed-gradient spin-echo nuclear magnetic resonance (PGSE-NMR) spectroscopy.
  • Photophysical studies and time-dependent density functional theory (TD-DFT) calculations.

Main Results:

  • A 2D polymeric structure of [AuAg3(C6F5)(CF3CO2)3(CH2PPh3)]n was elucidated, featuring Au...Ag, Ag...Ag, and Ag...O contacts.
  • Metallophilic interactions were found to be preserved in concentrated THF solutions.
  • Experimental photophysical data were consistent with TD-DFT calculations, indicating a metal-to-ligand charge-transfer phosphorescence.
  • Ab initio calculations estimated the Au...Ag interaction energy at approximately 60 kJ mol(-1).

Conclusions:

  • The studied gold-silver complex exhibits remarkable structural stability in solution due to persistent metallophilic interactions.
  • The findings contribute to understanding structure-property relationships in polynuclear metal complexes.
  • The complex shows potential for applications in areas requiring specific photophysical characteristics.