Syntheses,structures and single-molecule magnetic behaviors of two dicubane Mn4 complexes |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Key Laboratory of Nanomagnetic and Functional Materials, Inner Mongolia University, Hohhot 010021, China;2. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062, China;1. University of California San Francisco, Department of Dermatology, Mt. Zion Cancer Research Center, 2340 Sutter Street N461, 94115 San Francisco, USA;2. Department of Medical Sciences, Section of Dermatology, University of Turin, Italy;3. The Rudolfstiftung Hospital, Academic Teaching Hospital, Medical University Vienna, Department of Dermatology, Juchgasse 25, 1030 Vienna, Austria;4. University of California San Francisco, School of Pharmacy, Pharmaceutical Chemistry, 600 16th Street, 94158 San Francisco, USA;5. Hospital Universitario 12 de Octubre, Madrid, Spain;6. School of Medicine, Sigmund Freud University Vienna, Austria |
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| Abstract: | 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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