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Updated: Dec 31, 2025
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
Octametallic Cluster of Cp*Ir(glycinato) Cations
David M Morris1, Joseph S Merola1
1Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States.
The study reveals that removing chloride from Cp*Ir(glycinato)Cl with silver or thallium hexafluorophosphate forms an octametallic iridium cation loop. This structure sequesters hexafluorophosphate anions, differing from previously reported trimetallic complexes.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Supramolecular Chemistry
Background:
- Piano-stool iridium complexes with amino acids typically form trimetallic cations.
- The aggregation behavior of such complexes is influenced by counter anions.
Purpose of the Study:
- To investigate the formation of novel supramolecular structures from Cp*Ir(glycinato)Cl.
- To explore the role of counter anions in directing the assembly of iridium complexes.
Main Methods:
- Synthesis of Cp*Ir(glycinato)Cl and its reaction with Ag[PF6] or Tl[PF6].
- Characterization of resulting complexes using X-ray crystallography.
- Analysis of monometallic, trimetallic, and octametallic species.
Main Results:
- Formation of a unique octametallic loop cation, [Cp*Ir(glycinato)]8^8+, which encapsulates PF6- anions.
- Observation that the anion (PF6-) dictates the formation of the octametallic structure over the previously reported trimetallic structure.
- Successful synthesis and structural elucidation of octametallic, trimetallic, and monometallic iridium complexes.
Conclusions:
- The anion plays a critical role in the self-assembly of Cp*Ir(glycinato) complexes, enabling the formation of unprecedented octametallic structures.
- This work expands the known structural diversity of organometallic complexes derived from amino acid ligands.
- The findings challenge previous assumptions about the exclusive formation of trimetallic entities in similar systems.
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