title: Three-coordinate metal centers in extended transition metal oxides.
abstract: The n = 3 Ruddlesden-Popper phase Sr3LaFe1.5Co1.5O10+/-delta is capable of sustaining O contents as low as O7.5 with a mean metal oxidation state of +2 and three coordination at the central site in the trilayer of originally octahedral transition metal sites. The shortening of the axial bonds to the flanking octahedral layers stabilizes the low oxidation state and consequent unusual low coordination number of the Fe2+ and Co2+ cations within the extended structure.
authors.affiliation: Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, United Kingdom.
authors.forename: Amy
authors.initials: A
authors.lastname: Bowman
authors.forename: Mathieu
authors.initials: M
authors.lastname: Allix
authors.forename: Denis
authors.initials: D
authors.lastname: Pelloquin
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Rosseinsky