title: Spin structure of surface-supported single-molecule magnets from isomorphous replacement and X-ray magnetic circular dichroism.
abstract: Surface-supported arrays of Fe(4)-type Single-Molecule Magnets retain a memory effect and are of current interest in the frame of molecule-based information storage and spintronics. To reveal the spin structure of [Fe(4)(L)(2)(dpm)(6)] (1) on Au, an isomorphous compound [Fe(3)Cr(L)(2)(dpm)(6)] was synthesized and structurally and magnetically characterized (H(3)L is tripodal ligand 11-(acetylthio)-2,2-bis(hydroxymethyl)undecan-1-ol and Hdpm is dipivaloylmethane). The new complex contains a central Cr(3+) ion and has a S = 6 ground state as opposed to S = 5 in 1. Low-temperature X-ray Magnetic Circular Dichroism studies at Fe- and Cr-L(2,3) edges revealed that the antiparallel alignment between Fe and Cr spins is preserved on surfaces. Moreover, the different Fe-L(2,3) spectral features found in the homo- and heterometallic species disclose the opposing contribution of the central Fe(3+) ion in the former compound, proving that its ferrimagnetic spin structure is retained on surfaces.
authors.affiliation: Department of Chemistry Ugo Schiff and INSTM RU, University of Florence, 50019 Sesto Fiorentino, Italy.
authors.forename: Matteo
authors.initials: M
authors.lastname: Mannini
authors.forename: Erik
authors.initials: E
authors.lastname: Tancini
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Sorace
authors.forename: Philippe
authors.initials: P
authors.lastname: Sainctavit
authors.forename: Marie-Anne
authors.initials: MA
authors.lastname: Arrio
authors.forename: Yu
authors.initials: Y
authors.lastname: Qian
authors.forename: Edwige
authors.initials: E
authors.lastname: Otero
authors.forename: Daniele
authors.initials: D
authors.lastname: Chiappe
authors.forename: Ludovica
authors.initials: L
authors.lastname: Margheriti
authors.forename: Julio C
authors.initials: JC
authors.lastname: Cezar
authors.forename: Roberta
authors.initials: R
authors.lastname: Sessoli
authors.forename: Andrea
authors.initials: A
authors.lastname: Cornia
mesh_terms: D002942:Circular Dichroism; D018360:Crystallography, X-Ray; D008280:Magnetics; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D009942:Organometallic Compounds