title: A family of cyanide-bridged molecular squares: structural and magnetic properties of [{MIICl2}2{CoII(triphos)(CN)2}2].xCH2Cl2, M = Mn, Fe, Co, Ni, Zn.
abstract: The syntheses, structures, and magnetic properties of a series of tetranuclear cyanide-bridged compounds are reported. This family of molecular squares, [{M(II)Cl2}2{Co(II)(triphos)(CN)2}2] (M = Mn ([CoMn]), Fe ([CoFe]), Co ([CoCo]), Ni ([CoNi]), and Zn ([CoZn]), triphos = 1,1,1-tris(diphenylphosphinomethyl)ethane), has been synthesized by the reaction of Co(II)(triphos)(CN)2 and MCl2 (M = Mn, Co, Ni, Zn) or Fe4Cl8(THF)6 in a CH2Cl2/EtOH mixture. These complexes are isostructural and consist of two pentacoordinate Co(II) and two tetrahedral M(II) centers. The resulting molecular squares are characterized by antiferromagnetic coupling between metal centers that generally follows the spin-coupling model S total = SM(II)1 - SCo1 + SM(II)2 - SCo2. Magnetic parameters for all the complexes were measured using SQUID magnetometry. Additionally, [CoZn] and [CoMn] were studied by both conventional and high-frequency and high-field electron paramagnetic resonance.
authors.affiliation: Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
authors.forename: Ferdi
authors.initials: F
authors.lastname: Karadas
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Schelter
authors.forename: Michael
authors.initials: M
authors.lastname: Shatruk
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Prosvirin
authors.forename: John
authors.initials: J
authors.lastname: Bacsa
authors.forename: Dmitry
authors.initials: D
authors.lastname: Smirnov
authors.forename: Andrew
authors.initials: A
authors.lastname: Ozarowski
authors.forename: J
authors.initials: J
authors.lastname: Krzystek
authors.forename: Joshua
authors.initials: J
authors.lastname: Telser
authors.forename: Kim R
authors.initials: KR
authors.lastname: Dunbar
mesh_terms: D002712:Chlorides / Q000737:chemistry*; D003486:Cyanides / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D008280:Magnetics; D017895:Manganese Compounds / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D009532:Nickel / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D002712:Chlorides; D003486:Cyanides; D005296:Ferrous Compounds; D017895:Manganese Compounds; D017967:Zinc Compounds; C022838:nickel chloride; D009532:Nickel; C016837:zinc chloride; C025340:manganese chloride; C029451:ferrous chloride