title: Cyanide-bridged Fe(III)-Mn(III) bimetallic complexes with dimeric and chain structures constructed from a newly made mer-Fe tricyanide: structures and magnetic properties.
abstract: Four cyanide-linked Fe(III)-Mn(III) complexes were prepared by reacting Mn Schiff bases with a new molecular precursor (PPh(4))[Fe(qcq)(CN)(3)] [1; qcq = 8-(2-quinolinecarboxamido)quinoline anion]. They include a dimeric molecule, [Fe(qcq)(CN)(3)][Mn(3-MeOsalen)(H(2)O)] x 2 H(2)O [2 x 2 H(2)O; 3-MeOsalen = N,N'-ethylenebis(3-methoxysalicylideneiminato) dianion], and three 1D zigzag chains, [Fe(qcq)(CN)(3)][Mn(5-Clsalen)] x 3 H(2)O [3 x 2 MeOH; 5-Clsalen = N,N'-ethylenebis(5-chlorosalicylideneiminato) dianion], [Fe(qcq)(CN)(3)][Mn(5-Brsalen)] x 2 MeOH [4 x 2 MeOH; 5-Brsalen = N,N'-ethylenebis(5-bromosalicylideneiminato) dianion], and Fe(qcq)(CN)(3)][Mn(salen)].MeCN x H(2)O [5 x MeCN; salen = N,N'-ethylenebis(salicylideneiminato) dianion]. The complexes consist of extensive hydrogen bonding and pi-pi stacking interactions, generating multidimensional structures. Magnetic studies demonstrate that antiferromagnetic couplings are operative between Fe(III) and Mn(III) centers bridged by cyanide ligands. On the basis of an infinite chain model, magnetic coupling parameters of 2-5 range from -9.3 to -14.1 cm(-1). A long-range order is observed at 2.3 K for 3 and 2.2 K for 4, while compound 5 shows spin glass behavior possibly coupled with magnetic ordering.
authors.affiliation: Department of Chemistry, Korea University, Seoul 136-713, Korea.
authors.forename: Jae Il
authors.initials: JI
authors.lastname: Kim
authors.forename: Hyun Young
authors.initials: HY
authors.lastname: Kwak
authors.forename: Jung Hee
authors.initials: JH
authors.lastname: Yoon
authors.forename: Dae Won
authors.initials: DW
authors.lastname: Ryu
authors.forename: In Young
authors.initials: IY
authors.lastname: Yoo
authors.forename: Namgeun
authors.initials: N
authors.lastname: Yang
authors.forename: Beong Ki
authors.initials: BK
authors.lastname: Cho
authors.forename: Je-Geun
authors.initials: JG
authors.lastname: Park
authors.forename: Hyosug
authors.initials: H
authors.lastname: Lee
authors.forename: Chang Seop
authors.initials: CS
authors.lastname: Hong