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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 7
BKCSDE 26(7)
July 20, 2005 

 
Title
Synthesis, Structure and Magnetic Properties of Mn12 Single Molecule Magnet Containing 4-(Methylthio)benzoate as Peripheral Ligands
Author
Jin Mook Lim, Youngkyu Do, Jinkwon Kim*
Keywords
Single-molecule magnets, Manganese, Magnetic relaxation, 4-(Methylthio)benzoate
Abstract
[Mn12O12(O2CPh-4-SMe)16(H2O)4]·7CH2Cl2 (1), a new single-molecule magnet complex has been successfully synthesized by substitution of acetate ligand of Mn12ac with 4-(methylthio)benzoic acid. Complex 1 crystallizes into triclinic P with a = 18.321(3) A, b = 19.011(3) A, c = 27.230(4) A, α = 86.973(3)o, β = 76.919(3)o, γ = 87.613(3)o, and Z = 2. In complex 1, one Mn(III) ion has an abnormal Jahn-Teller elongation axis oriented at an oxide ion. Complex 1 has two out-of-phase ac susceptibility peaks in the 2-4 K and 4-7 K regions. Effective anisotropy energy barrier and pre-exponential factor are Ueff = 45.95 K, 1/τ0 = 8.6 × 109 s-1 for χM'' peaks in the lower temperature region and Ueff = 59.45 K, 1/τ0 = 2.2 × 108 s-1 for χM'' peaks in the higher temperature region. The parameters of S = 10, g = 1.87, D = -0.40 cm-1, and E = 0.00034 cm-1 were obtained from the M/NμB vs. H/T plot of complex 1.
Page
1065 - 1070
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