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.
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.
Karadas
Ferdi
F
Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
Schelter
Eric J
EJ
Shatruk
Michael
M
Prosvirin
Andrey V
AV
Bacsa
John
J
Smirnov
Dmitry
D
Ozarowski
Andrew
A
Krzystek
J
J
Telser
Joshua
J
Dunbar
Kim R
KR
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*
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