The compound pictured, an arene-soluble potassium salt of a sterically demanding diazapentadienyl ligand, is accessible in two short steps from commercially available, inexpensive regents. The anion may compete with amidinate or Cp* ligands in solubilizing and controlling the environment of metal ions; it effectively engulfs the potassium ion while appearing to be merely bidentate. Only weak single η5 contacts to substituted phenyl groups link the monomers.
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Clegg et al. (1998) studied this question.
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