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12:59
A Study of the Complexation of MercuryII with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry
Published on: January 8, 2016
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Gold(I) ethylene complexes supported by electron-rich scorpionates.
Jiang Wu1, Anurag Noonikara-Poyil1, Alvaro Muñoz-Castro2
1Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, USA. dias@uta.edu.
Chemical Communications (Cambridge, England)
|January 12, 2021
Summary
Electron-rich tris(pyrazolyl)borate ligands stabilize gold(I) ethylene complexes. This stabilization enhances gold to ethylene pi-backbonding, confirmed by NMR spectroscopy and computational analysis.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Spectroscopy
Background:
- Gold(I) complexes are valuable in catalysis and materials science.
- Stabilizing reactive intermediates is crucial for understanding bonding.
- Tris(pyrazolyl)borate ligands offer tunable electronic properties.
Purpose of the Study:
- To synthesize and characterize novel gold(I) ethylene complexes.
- To investigate the electronic effects of electron-rich tris(pyrazolyl)borate ligands on gold-ethylene bonding.
- To elucidate the extent of pi-backbonding in these systems.
Main Methods:
- Synthesis of gold(I) complexes featuring tris(pyrazolyl)borate ligands.
- Nuclear Magnetic Resonance (NMR) spectroscopy (1H, 13C) for structural and electronic analysis.
- Computational chemistry (e.g., DFT) to model bonding interactions.
Main Results:
- Successful stabilization of gold(I) ethylene complexes using κ2-bound tris(pyrazolyl)borate ligands.
- Observation of significant up-field shifts in olefinic carbon NMR resonances.
- Determination of elongated C-C bond distances in the coordinated ethylene.
- Computational data corroborating enhanced Au(I) → ethylene π-backbonding.
Conclusions:
- Electron-rich tris(pyrazolyl)borate ligands strongly promote π-backbonding in gold(I) ethylene complexes.
- The observed spectroscopic and structural changes are direct indicators of enhanced metal-ligand interactions.
- This work provides insights into the fundamental bonding of gold complexes with unsaturated hydrocarbons.
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