Abstract
There has been great interest in metal–borane complexes following the discovery of metallaboratrane complexes in 1999. These complexes contain unusual Z-type (σ-acceptor) coordination of borane functional groups and have been shown to provide unexpected coordination geometries and properties for a transition metal in a particular oxidation state. Additionally, such ligands exhibit unusually high trans influences only in certain geometries. Herein, a simple qualitative description, based on crystal field theory arguments, is presented for the explanation of the geometries and atypical trans labilisations observed. Trans labilisation: This discussion highlights the geometries observed within metal–borane complexes and discusses the origin of the labilisation of ligands in the site trans to boron.
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