title: Centred nine-metal rings of lanthanides.
abstract: Two {Ln10} cages are reported (Ln = Dy or Gd) which feature a nine-metal ring surrounding a central metal site. Magnetic studies show weak anti-ferromagnetic exchange around the nine-metal ring, which should create spin frustration.
authors.affiliation: School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK. richard.winpenny@manchester.ac.uk.
authors.forename: Karzan H
authors.initials: KH
authors.lastname: Zangana
authors.forename: Eufemio Moreno
authors.initials: EM
authors.lastname: Pineda
authors.forename: Eric J L
authors.initials: EJ
authors.lastname: McInnes
authors.forename: Jürgen
authors.initials: J
authors.lastname: Schnack
authors.forename: Richard E P
authors.initials: RE
authors.lastname: Winpenny