title: Syntheses, structures, and magnetic properties of cyano- and phenoxide-bridged Fe(III)-Mn(III) tetrameric assemblies formed by blocked fac-Fe tricyanide with aliphatic rings.
abstract: Three tetranuclear clusters [(Tp(Me,mt3))Fe(CN)3Mn(L)]2 (1, L = 5-Clacphmen; 2, L = 5-Clsalen; 3, L = 5-MeOsalen; Tp(Me,mt3) = hydrotris(3-methyl-4,5-propylene-5-methylpyrazol-1-yl)borate) were prepared by assembling the fac-Fe tricyanide with the corresponding Mn Schiff bases. The assembled molecules are linked by cyanide and phenoxide bridges. Weak π-π contacts between molecules are evident in these clusters. Compounds 1-3 exhibit slow relaxation of the magnetization. The phenoxide linkers mediate ferromagnetic coupling between the Mn centers, which is ascribed to the long axial Mn-O* length. The overall magnetic exchange coupling nature of the Fe-C≡N-Mn route is accounted for by the important structural parameters of bridging pathways such as Mn-N(cyano) length, Mn-N(cyano)-C(cyano) angle, and C(eq)-Fe···Mn-N(eq) (eq = equatorial) torsion angle.
authors: Department of Chemistry, Korea University, Seoul 136-713, Korea.
authors: Kyung Jin
authors: KJ
authors: Cho
authors: Dae Won
authors: DW
authors: Ryu
authors: Kwang Soo
authors: KS
authors: Lim
authors: Woo Ram
authors: WR
authors: Lee
authors: Jin Wuk
authors: JW
authors: Lee
authors: Eui Kwan
authors: EK
authors: Koh
authors: Chang Seop
authors: CS
authors: Hong
mesh_terms: D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D003486:Cyanides / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D008968:Molecular Conformation; D012545:Schiff Bases / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D003486:Cyanides; D005290:Ferric Compounds; D007477:Ions; D012545:Schiff Bases; D008345:Manganese