title: Influence of the ligand field on slow magnetization relaxation versus spin crossover in mononuclear cobalt complexes.
abstract: The electronic and magnetic properties of the complexes [Co(terpy)Cl2 ] (1), [Co(terpy)(NCS)2 ] (2), and [Co(terpy)2 ](NCS)2 (3) were investigated. The coordination environment around Co(II) in 1 and 2 leads to a high-spin complex at low temperature and single-molecule magnet properties with multiple relaxation pathways. Changing the ligand field and geometry with an additional terpy ligand leads to spin-crossover behavior in 3 with a gradual transition from high spin to low spin.
authors.affiliation: Chemistry Department, University of Ottawa, D'Iorio Hall, 10 Marie Curie, Ottawa, ON, K1N6N5 (Canada) http://mysite.science.uottawa.ca/mmuruges/index.html.
authors.forename: Fatemah
authors.initials: F
authors.lastname: Habib
authors.forename: Oana R
authors.initials: OR
authors.lastname: Luca
authors.forename: Veacheslav
authors.initials: V
authors.lastname: Vieru
authors.forename: Muhandis
authors.initials: M
authors.lastname: Shiddiq
authors.forename: Ilia
authors.initials: I
authors.lastname: Korobkov
authors.forename: Serge I
authors.initials: SI
authors.lastname: Gorelsky
authors.forename: Michael K
authors.initials: MK
authors.lastname: Takase
authors.forename: Liviu F
authors.initials: LF
authors.lastname: Chibotaru
authors.forename: Stephen
authors.initials: S
authors.lastname: Hill
authors.forename: Robert H
authors.initials: RH
authors.lastname: Crabtree
authors.forename: Muralee
authors.initials: M
authors.lastname: Murugesu
keywords: cobalt; multiple relaxation pathways; single-molecule magnets; spin crossover