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Updated: Mar 18, 2026

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Monomeric Chini-Type Triplatinum Clusters Featuring Dianionic and Radical-Anionic π*-Systems.

Brandon R Barnett1, Arnold L Rheingold1, Joshua S Figueroa2

  • 1Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive MC 0358, La Jolla, CA, 92193, USA.

Angewandte Chemie (International Ed. in English)
|June 28, 2016
PubMed
Summary
This summary is machine-generated.

Researchers synthesized and characterized novel platinum carbonyl clusters, [Pt3 (μ-CO)3 (CNAr(Dipp2) )3 ](n-) (n=0, 1, 2). These clusters show redox non-innocent behavior, with electron density delocalized across ligands.

Keywords:
cluster compoundsisocyanidesnon-innocent ligandsplatinum

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Binary platinum carbonyl clusters, known as Chini clusters ([Pt3 (CO)6 ]n (2-)), exhibit unique topologies and self-assembly properties.
  • These clusters have garnered sustained interest due to their structural diversity and potential applications.

Purpose of the Study:

  • To report the isolation and structural characterization of a novel trinuclear electron-transfer series of platinum clusters.
  • To investigate the electronic properties and redox behavior of monomeric Pt3 clusters supported by π-acidic ligands.

Main Methods:

  • Isolation and structural characterization of the [Pt3 (μ-CO)3 (CNAr(Dipp2) )3 ](n-) (n=0, 1, 2) series.
  • Spectroscopic analyses (e.g., NMR, IR) to probe electronic structure.
  • Computational modeling (e.g., DFT) to elucidate molecular orbital compositions.
  • Synthetic investigations to prepare and study the cluster series.

Main Results:

  • Successful isolation and full structural characterization of the trinuclear platinum cluster series in its neutral, monoanionic, and dianionic forms.
  • Spectroscopic and computational data reveal that the highest-occupied molecular orbitals (HOMOs) in the anionic clusters are primarily composed of π*-orbitals from the carbonyl (CO) and isocyanide (CNAr(Dipp2)) ligands.
  • A negligible contribution of platinum (Pt) character to the HOMOs was observed, indicating significant ligand-based redox activity.

Conclusions:

  • The study presents a unique set of monomeric Pt3 clusters stabilized by π-acidic ligands.
  • This work provides the first evidence for carbonyl and isocyanide ligands acting in a redox non-innocent manner within such platinum cluster systems.
  • The findings open new avenues for designing metal clusters with tunable electronic properties through ligand modification.