title: Solid-state dinuclear-to-trinuclear conversion in an oxalato-bridged chromium(III)-cobalt(II) complex as a new route toward single-molecule magnets.
abstract: A novel bis(oxalato)chromium(III) salt of a ferromagnetically coupled, oxalato-bridged dinuclear chromium(III)-cobalt(II) complex of formula [CrL(ox)(2)CoL'(H(2)O)(2)][CrL(ox)(2)]·4H(2)O (1) has been self-assembled in solution using different aromatic α,α'-diimines as blocking ligands, such as 2,2'-bipyridine (L = bpy) and 2,9-dimethyl-1,10-phenanthroline (L' = Me(2)phen). Thermal dehydration of 1 leads to an intriguing solid-state reaction between the S = 3/2 Cr(III) anions and the S = 3 Cr(III)Co(II) cations to give a ferromagnetically coupled, oxalato-bridged trinuclear chromium(III)-cobalt(II) complex of formula {[CrL(ox)(2)](2)CoL'} (2). Complex 2 possesses a moderately anisotropic S = 9/2 Cr(III)(2)Co(II) ground state, and it exhibits slow magnetic relaxation behavior at very low temperatures (T(B) < 2.0 K).
authors.affiliation: Departament de Química Inorgànica/Instituto de Ciencia Molecular, Universitat de València, E-46980 Paterna, València, Spain.
authors.forename: Julia
authors.initials: J
authors.lastname: Vallejo
authors.forename: Isabel
authors.initials: I
authors.lastname: Castro
authors.forename: Jesús
authors.initials: J
authors.lastname: Ferrando-Soria
authors.forename: Maria del Pino
authors.initials: Mdel P
authors.lastname: Déniz-Hernández
authors.forename: Catalina
authors.initials: C
authors.lastname: Ruiz-Pérez
authors.forename: Francesc
authors.initials: F
authors.lastname: Lloret
authors.forename: Miguel
authors.initials: M
authors.lastname: Julve
authors.forename: Rafael
authors.initials: R
authors.lastname: Ruiz-García
authors.forename: Joan
authors.initials: J
authors.lastname: Cano
mesh_terms: D002857:Chromium / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D008280:Magnetics; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D010070:Oxalates / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D009942:Organometallic Compounds; D010070:Oxalates; D002857:Chromium; D003035:Cobalt