Ligand-Stabilized [P4]2+ Cations


  • This work was supported by the European Phosphorus Science Network (PhoSciNet CM0802), the FCI (Liebig scholarship for J.J.W.) and the German Science Foundation (DFG, WE 4621/2-1). We also acknowledge the Natural Sciences and Engineering Research Council of Canada, the Killam Foundation, and the Canada Research Chairs Program for funding. We thank R. McDonald and M. J. Ferguson (University of Alberta, Edmonton) for initial X-ray investigations. J.J.W. thanks Prof. F. Ekkehardt Hahn (WWU Münster) for his generous support and advice.


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The bis(triphenylarsane) complex of the [P4]2+ dication has been formed in a high-yielding one-pot synthesis. X-ray crystallography reveals a butterfly structure of the bicyclo[1.1.0]-tetraphosphane-1,4-diium core, with two triphenylarsane ligands in an exo,exo configuration (see picture). The reaction of [(Ph3As)2P4]2+ with Ph3P results in the quantitative formation of [(Ph3P)2P4]2+ and Ph3As.