Peter L. Jones, Kate J. Byrom, John C. Jeffery, Jon A. McCleverty and Michael D. Ward
Reaction of the bis-bidentate ligand bis{3-(2-pyridyl)pyrazol-1-yl}dihydroborate (L-) with cobalt(II) or nickel(II) salts results in formation of complexes [M8L12X]X3 (X = ClO4, PF6), which have a cyclic structure with one anion encapsulated in the central cavity.