Germanium Dications as Ligands

  • Author:
  • Published: 15 January 2017
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
  • Source / Publisher: Chemical Communications/RSC Publishing
  • Associated Societies: Royal Society of Chemistry (RSC), UK
thumbnail image: Germanium Dications as Ligands

A wide variety of different ligands can be used to tune the properties of transition metal complexes, e.g., for catalysis. Ligands generally donate electron density to the metal center and are most often neutral or anionic. Cationic ligands, in contrast, are not nearly as common.

Ravindra K. Raut and Moumita Majumdar, Indian Institute of Science Education and Research, Pune, have prepared a dicationic germanium complex (pictured) which can bind to the transition metal centers Ag(I) and Au(I). This is the first example of a cationic group 14 ligand in a transition metal complex. The team synthesized the triflate salt of the Ge complex by combining a solution of GeCl2·dioxane and the ligand 2,7-bis(2-pyridyl)-3,6-diazaocta-2,6-diene (L) in CH2Cl2 with trimethylsilyl triflate (TMSOTf).

The [GeL]2+ complex (pictured), despite its positive charge, can bind to Ag+ and Au+ ions and form nearly linear complexes of the type [LGe-M-GeL][OTf]5. The researchers used density functional theory (DFT) calculation to understand the bonding situation in the resulting complexes. They found a σ-type donation of electrons from the lone pair at Ge to the transition metal and a π-type back-donation from the transition metal towards the germanium. The π-interaction compensates for the weak donor characteristics of the cationic ligand and strengthens the bond.


Article Views: 2117

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from, please contact us first for permission and consult our permisson guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH