Cyanoscorpionate ligands: agostic interactions in a series of metal complexes containing the Tris(4-cyano-3-phenylpyrazolyl)borate and Bis(4-cyano-3-phenylpyrazolyl)borate ligands
Kadel, Lava R.
Bullinger, John R.
Baum, Robert R.
Moore, Curtis E.
Tierney, David L.
Eichhorn, David M.
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Kadel, Lava R.; Bullinger, John R.; Baum, Robert R.; Moore, Curtis E.; Tierney, David L.; Eichhorn, David M. 2016. Cyanoscorpionate ligands: agostic interactions in a series of metal complexes containing the Tris(4-cyano-3-phenylpyrazolyl)borate and Bis(4-cyano-3-phenylpyrazolyl)borate ligands. European Journal of Inorganic Chemistry Special Issue: The Significance of Scorpionate Ligands 50 Years On (Cluster Issue), Volume 2016, Issue 15-16, pages 2543–2551
Scorpionate chemistry has long featured sandwich complexes with two trispyrazolylborate (Tp) or two bispyrazolylborate (Bp) ligands coordinated to a transition metal. Less common are complexes in which one Tp and one Bp ligand are coordinated to the metal. We report herein five such complexes of Ni-II, Mn-II, Co-II, or Fe-II involving Tp and Bp ligands comprising either 3-phenyl-4-cyanopyrazole or 3-phenylpyrazole, as well as a related Co-II complex with two Tp ligands, one of which is coordinated in a (2) fashion. All complexes feature an agostic interaction with a B-H hydrogen atom.
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