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     New Chemistry

 

 

 

     A transition metal borylene

     complex stabilized by a non-

     carbonyl ligand set: formation

     by spontaneous halide loss to

     give an extremely short metal-

     -boron bond (video).

     (work by David Addy)

 

 

 

 

Aldridge


New sterically demanding ligand systems

 

In recent work we have been examining the synthesis and application of novel, highly sterically demanding amido ligands in both main group and transition metal chemistry. Related aryl ligands have been utilized to great effect in recent years in the stabilization of metal complexes containing low coordinate, unsaturated metal centres. Such compounds are of great interest, not only from a fundamental bonding perspective (e.g. quintuple bonds involving Cr), but also because of the potential for useful reactivity displayed, for example, by low coordinate transition metal cations.

 

We have been seeking to extend this approach to related N-donor systems, initially focusing on the 1,8-disubstituted carbazolyl ligand class, as easily synthesized alternatives to the very widely-used terphenyl ligands. Initial studies using the dichlorogallium complexes as probes of ligand bulk, imply that these systems offer an even more sterically protected pocket than their more celebrated terphenyl counterparts. More recently the bis- and tetra-tert-butylcarbazolyl frameworks have been used to give access to M(I) species (M = Ga, In, Tl), the structural and reaction chemistry of which are currently under investigation.

 

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     Further Information

 

 

 

     Research Areas Overview

         Multiply bonded systems

         Metal boryl complexes

         Sensors

         Sterically demanding ligands

         References

         Collaborations

         Current project funding

 

 

 

     Figures

 

 

 

     (right) The polymeric structure of

     solid tetra-tert-butylcarbazolyl indium(I).

 

 

     (left) The 1,8-dimesitylcarbazolyl

     ligand is shown to have a wider cone

     angle (269o vs 185o) than the corres-

     ponding 2,6-dimesitylphenyl ligand:

     Dalton Trans. 2008, 332.

 

 

 

     New chemistry (video)

 

 

 

     A mixed valence In(I)/In(II) system

     Stabilized by amido ligands. Click

     here.

     (work of Hassanatu Mansaray)