TY - JOUR
T1 - Syntheses, structures and single-molecule magnetic behaviors of two dicubane Mn4 complexes
AU - Yang, Chen I.
AU - Lee, Gene Hsiang
AU - Wur, Ching Shuei
AU - Lin, Jauyn G.
AU - Tsai, Hui Lien
N1 - Funding Information:
We thank the National Science Council of the Republic of China (NSC-93-2113-M-006-016) for support.
PY - 2005/11/17
Y1 - 2005/11/17
N2 - The reaction of MnX2·4H2O (X = Cl or Br) with 2,6-bis(hydroxymethyl)-4-methylphenol (H3L) and NaOH in methanol solution yielded two tetranuclear manganese complexes, [Mn4(HL) 4(MeOH)4Cl2] (1) and [Mn4(HL) 4(MeOH)4Br2] (2). Both compounds crystallize in the monoclinic space group C2/c with cell parameters: a = 26.0945(19) Å, b = 11.4999(8) Å, c = 21.2188(16) Å, β = 121.050(1)° and z = 4 for 1·2Et2O; a = 25.8145(3) Å, b = 11.6734(2) Å, c = 21.3956(3) Å, β = 120.1277(6)° and z = 4 for 2·2Et2O. Both complexes consist of a mixed-valence dicubane structure, which comprises two MnII and two MnIII ions. Magnetic susceptibilities and magnetization of complexes 1 and 2 in the solid state indicate that two clusters have an S = 9 ground state. Frequency-dependent out-of-phase signals of alternating current magnetic susceptibilities were observed in the low temperature range (<3 K) for both complexes indicating a slow magnetic relaxation.
AB - The reaction of MnX2·4H2O (X = Cl or Br) with 2,6-bis(hydroxymethyl)-4-methylphenol (H3L) and NaOH in methanol solution yielded two tetranuclear manganese complexes, [Mn4(HL) 4(MeOH)4Cl2] (1) and [Mn4(HL) 4(MeOH)4Br2] (2). Both compounds crystallize in the monoclinic space group C2/c with cell parameters: a = 26.0945(19) Å, b = 11.4999(8) Å, c = 21.2188(16) Å, β = 121.050(1)° and z = 4 for 1·2Et2O; a = 25.8145(3) Å, b = 11.6734(2) Å, c = 21.3956(3) Å, β = 120.1277(6)° and z = 4 for 2·2Et2O. Both complexes consist of a mixed-valence dicubane structure, which comprises two MnII and two MnIII ions. Magnetic susceptibilities and magnetization of complexes 1 and 2 in the solid state indicate that two clusters have an S = 9 ground state. Frequency-dependent out-of-phase signals of alternating current magnetic susceptibilities were observed in the low temperature range (<3 K) for both complexes indicating a slow magnetic relaxation.
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U2 - 10.1016/j.poly.2005.03.105
DO - 10.1016/j.poly.2005.03.105
M3 - Article
AN - SCOPUS:27644557840
VL - 24
SP - 2215
EP - 2221
JO - Polyhedron
JF - Polyhedron
SN - 0277-5387
IS - 16-17
ER -