Ligands based on the hydrotris(pyrazol-1-yl)borate (Tp) framework are ubiquitous in the inorganic chemistry literature. These are employed to support complexes with a wide variety of metal oxidation states and coordination geometries. The modular nature of Tp ligands is commonly exploited by introducing substituents at each of the carbon atoms of the pyrazolyl groups, but fewer studies have examined the impact of exchanging the hydrogen bound to boron with alkyl or aryl substituents. As part of a wider project working to synthesize metal complexes of bulky Tp ligands that are more amenable with respect to metal-based chemical reduction than their hydrotris(pyrazol-1-yl)borate analogues, we herein report two new phenyltris(pyrazol-1-yl)borates, with varying degrees of fluorination at the phenylborate substituent, and comparatively assess their electronic impact at nitrogen-bound metals.

Examination of the donor capabilities of 3,4,5-trifluorophenyl- and 3,5-bis(trifluoromethyl)phenyltris(pyrazol-1-yl)borate ligands

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