Dialkylbiphenylphosphane-AuI complexes exhibit only weak metal-arene interactions with the covering arene ring. However, the contacts in isoleptic AgI and CuI complexes are shorter than the limiting values of 3.03 Å (AgI) and 2.83 Å (CuI). Strong metal-arene interactions were also found in the two AgI aquo complexes and in two acetonitrile—CuI complexes with dialkylbiphenylphosphane ligands. Arene-AgI complexes with these bulky phosphane ligands show the strongest AgI—arene bonds known.
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![Metal–arene interactions in dialkylbiarylphosphane complexes of copper, silver, and gold](https://www.iciq.org/wp-content/uploads/2014/03/Metalarene-interactions_5324.gif)