title: One-dimensional end-to-end azide-bridged Mn(III) complexes incorporating alkali metal ions: slow magnetic relaxations and metamagnetism.
abstract: Three azide-bridged Mn(III) chains [Mn(3-MeOsalpn)(N(3))]⋅0.5 AClO(4) (A = Na (1), K (2), Rb (3); 3-MeOsalpn = N,N'-propylenebis(3-methoxysalicylideneiminato) dianion) incorporating alkali metal ions and perchlorate anions were systematically synthesized. The overall structure can be described as a one-dimensional chain bridged by end-to-end azide ligands, although spatial arrangements of Jahn-Teller axes of Mn in 1 and 2 are different from that in 3. Relying on the alkali metal ions, magnetic properties are varied from a two-step phase transition (1) to metamagnetic transitions (2 and 3). In this system, spin canting definitely plays a central role in giving rise to the apparent slow magnetic relaxations in 1 and 2 because application of a high external magnetic field tends to destroy single-chain magnet (SCM) properties. Despite the existence of a long-range antiferromagnetic order at T(N) , slow magnetic relaxation is notably observed in 2, which likely emanates from the operative spin canting below T(N) .
authors.affiliation: Department of Chemistry, Korea University, Seoul 136-713, Korea.
authors.forename: Jung Hee
authors.initials: JH
authors.lastname: Yoon
authors.forename: Jin Wuk
authors.initials: JW
authors.lastname: Lee
authors.forename: Dae Won
authors.initials: DW
authors.lastname: Ryu
authors.forename: Sung Won
authors.initials: SW
authors.lastname: Yoon
authors.forename: Byoung Jin
authors.initials: BJ
authors.lastname: Suh
authors.forename: Hyoung Chan
authors.initials: HC
authors.lastname: Kim
authors.forename: Chang Seop
authors.initials: CS
authors.lastname: Hong