title: A novel undecametallic iron(III) cluster with an S = (11)/(2) spin ground state.
abstract: The reaction of [NEt(4)](2)[Fe(2)OCl(6)] with sodium benzoate, 4,6-dimethyl-2-hydroxypyrimidine (dmhp), and 1,1,1-tris(hydroxymethyl)ethane (H(3)thme) gives the undecametallic compound [NEt(4)][Fe(11)O(4)(O(2)CPh)(10)(thme)(4)(dmhp)(2)Cl(4)]. X-ray crystallography, EPR spectroscopy, bulk magnetic susceptibility studies, and low-temperature single-crystal magnetic measurements were used to characterize the compound. Magnetic measurements indicate an S = (11)/(2) ground state with the parameters g = 2.03 and D = -0.46 cm(-)(1). Single-crystal magnetic studies show hysteresis of molecular origin at T < 1.2 K with fast quantum mechanical tunneling at zero field.
authors.affiliation: Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
authors.forename: Leigh F
authors.initials: LF
authors.lastname: Jones
authors.forename: Euan K
authors.initials: EK
authors.lastname: Brechin
authors.forename: David
authors.initials: D
authors.lastname: Collison
authors.forename: Madeleine
authors.initials: M
authors.lastname: Helliwell
authors.forename: Talal
authors.initials: T
authors.lastname: Mallah
authors.forename: Stergios
authors.initials: S
authors.lastname: Piligkos
authors.forename: Gopalan
authors.initials: G
authors.lastname: Rajaraman
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wernsdorfer