Remote Multiproton Storage within a Pyrrolide-Pincer-Type Ligand.
A chemically non-innocent pyrrole-based trianionic (ONO)(3-) pincer ligand within [(pyr-ONO)TiCl(thf)2 ] (2) can access the dianionic [(3H-pyr-ONO)TiCl2 (thf)] (1-THF) and monoanionic [(3H,4H-pyr-ONO)TiCl2 (OEt2 )][B{3,5-(CF3 )2 C6 H3 }4 ] (3-Et2 O) states through remote protonation of the pyrrole γ-C π-bonds. The homoleptic [(3H-pyr-ONO)2 Zr] (4) was synthesized and characterized by X-ray diffraction and NMR spectroscopy in solution. The protonation of 4 by [H(OEt2 )2 ][B{C6 H3 (CF3 )2 }4 ] yields [(3H,4H-pyr-ONO)(3H-pyr-ONO)Zr][B{3,5-(CF3 )2 C6 H3 }4 ] (5), thus demonstrating the storage of three protons.
University of Florida, Center for Catalysis, P.O. Box 117200 (USA) https://veige.chem.ufl.edu/
Soufiane S
SS
Nadif
University of Florida, Center for Catalysis, P.O. Box 117200 (USA) https://veige.chem.ufl.edu/
Matthew E
ME
O'Reilly
University of Florida, Center for Catalysis, P.O. Box 117200 (USA) https://veige.chem.ufl.edu/
Ion
I
Ghiviriga
University of Florida, Center for Catalysis, P.O. Box 117200 (USA) https://veige.chem.ufl.edu/
Khalil A
KA
Abboud
University of Florida, Center for Catalysis, P.O. Box 117200 (USA) https://veige.chem.ufl.edu/. veige@chem.ufl.edu.
Adam S
AS
Veige
N,O ligands; proton storage; protonation; redox chemistry; titanium