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http://140.128.103.80:8080/handle/310901/21194
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| Title: | Syntheses, structures and single-molecule magnetic behaviors of two dicubane Mn4 complexes |
| Authors: | Yang, C.-I.a, Lee, G.-H.b, Wur, C.-S.c, Lin, J.G.d, Tsai, H.-L. |
| Contributors: | Department of Chemistry, Tunghai University |
| Keywords: | Exchange interaction;Magnetic relaxation;Magnetoanisotropy;Mixed-valence;Single-molecule magnet;Tetranuclear manganese complex |
| Date: | 2005 |
| Issue Date: | 2013-05-14T09:03:13Z (UTC)
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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) ?, b = 11.4999(8) ?, c = 21.2188(16) ?, β = 121.050(1)° and z = 4 for 1·2Et2O; a = 25.8145(3) ?, b = 11.6734(2) ?, c = 21.3956(3) ?, 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. ? 2005 Elsevier Ltd. All rights reserved. |
| Relation: | Polyhedron
Volume 24, Issue 16-17, 17 November 2005, Pages 2215-2221 |
| Appears in Collections: | [化學系所] 期刊論文
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