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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Structural Isomerism02:34

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Isomerism in Complexes
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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Tetrahedral Complexes
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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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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Acid-base responsive switching between "3+1" and "2+2" platinum complexes.

Dhassida Sooksawat1, Sarah J Pike, Alexandra M Z Slawin

  • 1EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh, EH9 3JJ, UK. Paul.Lusby@ed.ac.uk.

Chemical Communications (Cambridge, England)
|October 22, 2013
PubMed
Summary
This summary is machine-generated.

Acid-base reactions can control ligand exchange in cyclometallated platinum complexes. This finding offers new ways to modify platinum-based compounds for various applications.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Cyclometallated platinum complexes are versatile compounds with applications in catalysis and medicine.
  • Controlling ligand exchange is crucial for tuning the properties and reactivity of metal complexes.

Purpose of the Study:

  • To investigate the use of acid-base chemistry to induce ligand exchange in cyclometallated platinum complexes.
  • To explore the influence of ligand denticity on the exchange process.

Main Methods:

  • Synthesis of a cyclometallated platinum complex.
  • Treatment with varying acidic and basic conditions.
  • Analysis of ligand exchange using spectroscopic techniques (e.g., NMR, Mass Spectrometry).

Main Results:

  • Demonstrated that pH changes can reversibly trigger the exchange of ancillary ligands.
  • Showcased the ability to replace ligands of different denticities (e.g., monodentate, bidentate).
  • Identified specific pH ranges for selective ligand substitution.

Conclusions:

  • Acid-base stimuli provide a facile and tunable method for ligand manipulation in platinum complexes.
  • This approach allows for the rational design of functional platinum compounds.
  • Potential applications in developing responsive materials and drug delivery systems.