What are the similarities and differences between cyclopentadienyl and tris(pyrazolyl)borate ligands in transition metal complexes?
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Cyclopentadienyl and tris(pyrazolyl)borate ligands are both commonly used in transition metal complexes. While cyclopentadienyl ligands are extensively employed in olefin polymerization catalysis , tris(pyrazolyl)borate ligands are known for their stability and ability to fine-tune the coordination site for metal centers . Both ligands form stable complexes with metal ions, with the tris(pyrazolyl)borate ligands acting as tripodal 'capping' ligands in 1:1 compounds . However, tris(pyrazolyl)borate ligands offer more versatility due to the availability of various steric and electronic substituents at the pyrazolyl rings, allowing for precise tuning of the metal-carbon bonds and coordination geometries . In contrast, cyclopentadienyl ligands have been less explored with certain substituents, limiting their applications in comparison to tris(pyrazolyl)borate ligands .
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| Papers (4) | Insight |
|---|---|
| Tris(pyrazolyl)borate ligands like TpCy and TpNp in transition metal complexes act as tripodal capping ligands, offering directed design potential, unlike cyclopentadienyl ligands, enabling stable polynuclear structures. | |
| Both cyclopentadienyl and tris(pyrazolyl)borate ligands are commonly used in transition metal complexes, while tris(1-tert-butyl-2-mercaptoimidazolyl)hydroborate ligands show potential for similar applications. | |
| Cyclopentadienyl and tris(pyrazolyl)borate ligands both coordinate transition metals, but differ in structure and reactivity. Cyclopentadienyl activates toluene via C-H activation, while tris(pyrazolyl)borate forms mercaptopyridyl complexes. | |
| Tris(carbene)borates exhibit stronger σ donation and greater covalency in metal-carbon bonds compared to tris(pyrazolyl)borate ligands in transition metal complexes, as shown in DFT analyses. |
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