| Autor: |
Straiton AJ; Department of Chemistry, University of Bath, Claverton Down BA2 7AY, U.K., McMullin CL; Department of Chemistry, University of Bath, Claverton Down BA2 7AY, U.K., Kociok-Köhn G; Material and Chemical Characterisation Facility, University of Bath, Claverton Down BA2 7AY, U.K., Lyall CL; Material and Chemical Characterisation Facility, University of Bath, Claverton Down BA2 7AY, U.K., Parish JD; Infineum UK Ltd., Milton Hill Business and Technology Centre, Abingdon OX13 6BB, Oxfordshire, U.K., Johnson AL; Department of Chemistry, University of Bath, Claverton Down BA2 7AY, U.K. |
| Abstrakt: |
Analogous to the ubiquitous alkoxide ligand, metal boroxide and boryloxy complexes are an underexplored class of hard anionic O - ligand. A new series of amine-stabilized Li, Sn(II), and Zn boryloxy complexes, comprising electron-rich tetrahedral boron centers have been synthesized and characterized. All complexes have been characterized by one-dimensional (1D), two-dimensional (2D), and DOSY NMR, which are consistent with the solid-state structures unambiguously determined via single-crystal X-ray diffraction. Electron-rich μ 2 - (Sn and Zn) and μ 3 - (Li) boryloxy binding modes are observed. Compounds 6 - 9 are the first complexes of this class, with the chelating bis- and tris-phenol ligands providing a scaffold that can be easily functionalized and provides access to the boronic acid pro-ligand, hence allowing facile direct synthesis of the resulting compounds. Computational quantum chemical studies suggest a significant enhancement of the π-donor ability of the amine-stabilized boryloxy ligand because of electron donation from the amine functionality into the p-orbital of the boron atom. |
