The development of tris(phosphino)phenylborates (PhBP3), commonly referred to as strongly donating scorpionates, has facilitated the synthesis of transition metal complexes with novel electronic structures. The modular nature of these borates permits alternate substituents at phosphorous as the most direct way to modulate ligand donation. To date, tris(diisopropylphosphinomethyl)phenylborate and tris(diphenylphosphinomethyl)phenylborate are the most utilized ligands of this class. While the former is undoubtedly more electron-rich than the latter, the vast majority of complexes prepared to date with tris(phosphino)borates are charge-neutral and zwitterionic, where the borate negative charge balances a positive formal charge of the metal fragment. The Fischer group is exploring the chemistry of tris(phosphino)borates towards zerovalent group VI metals. This poster will provide a detailed comparison of the relative impact of tris(diisopropylphosphinomethyl)phenylborate and tris(diphenylphosphinomethyl)phenylborate at the metal centers in salts of [M(CO)3(PhBP3)]- (M = Cr, Mo, W) in light of the strongly donating scorpionate classification of these ligands.

Examination of the relative impact of tris(diisopropylphosphinomethyl)phenylborate and tris(diphenylphosphinomethyl)phenylborate in salts of [M(CO)3(PhBP3)]- (M = Cr, Mo, W)

253rd National Meeting (2017)

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