Mixed-metal single-molecule magnets: Syntheses, structure, and magnetic properties of [Mn8Fe4O12(O2CR) 16(H2O)4] (R = CH2Cl, CH 2Br, CHCl2)

Chen I. Yang, Shwu Fen Yang, Shao Po Hung, Gene Hsiang Lee, Ching Shuei Wur, Hui Lien Tsai

Research output: Contribution to journalArticle

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Abstract

Three mixed-metal single-molecule magnets containing [Mn8Fe 4O12]16+ cores are synthesized and characterized. The reaction of FeCl2·4H2O with KMnO4 and RCOOH (R = CH2Cl, CH2Br) in H 2O gives [Mn8Fe4O12(O 2CR)16(H2O)4] (R = CH2Cl (1), CH2Br (2)) in yields of 43% and 40%, respectively. Treatment of complex 1 with an excess of CHCl2COOH in CH2Cl2 gives [Mn8Fe4O12(O2CCHCl 2)16(H2O)4]·CH 2Cl2·10H2O (3·CH 2Cl2·10H2O) in a yield of 83%. The X-ray structure analysis reveals that all three complexes consist of a trapped-valence dodecanuclear core comprising 4MnIII, 4Fe III, and 4MnIV ions. DC magnetic susceptibility and magnetization measurements indicate that all three complexes exhibit intramolecular antiferromagnetic interaction, resulting in an S = 4 ground state. In addition, frequency-dependent out-of-phase AC magnetic susceptibility signals at low temperature for complexes 1, 2, and 3 are indicative of their single-molecule magnetism behavior.

Original languageEnglish
Pages (from-to)2969-2977
Number of pages9
JournalPolyhedron
Volume30
Issue number18
DOIs
Publication statusPublished - 2011 Nov 28

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Magnetic susceptibility
Magnets
Magnetic properties
magnets
Metals
methylidyne
magnetic properties
magnetic permeability
Molecules
Magnetism
synthesis
metals
Ground state
molecules
Magnetization
alternating current
direct current
Ions
valence
X rays

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Yang, Chen I. ; Yang, Shwu Fen ; Hung, Shao Po ; Lee, Gene Hsiang ; Wur, Ching Shuei ; Tsai, Hui Lien. / Mixed-metal single-molecule magnets : Syntheses, structure, and magnetic properties of [Mn8Fe4O12(O2CR) 16(H2O)4] (R = CH2Cl, CH 2Br, CHCl2). In: Polyhedron. 2011 ; Vol. 30, No. 18. pp. 2969-2977.
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abstract = "Three mixed-metal single-molecule magnets containing [Mn8Fe 4O12]16+ cores are synthesized and characterized. The reaction of FeCl2·4H2O with KMnO4 and RCOOH (R = CH2Cl, CH2Br) in H 2O gives [Mn8Fe4O12(O 2CR)16(H2O)4] (R = CH2Cl (1), CH2Br (2)) in yields of 43{\%} and 40{\%}, respectively. Treatment of complex 1 with an excess of CHCl2COOH in CH2Cl2 gives [Mn8Fe4O12(O2CCHCl 2)16(H2O)4]·CH 2Cl2·10H2O (3·CH 2Cl2·10H2O) in a yield of 83{\%}. The X-ray structure analysis reveals that all three complexes consist of a trapped-valence dodecanuclear core comprising 4MnIII, 4Fe III, and 4MnIV ions. DC magnetic susceptibility and magnetization measurements indicate that all three complexes exhibit intramolecular antiferromagnetic interaction, resulting in an S = 4 ground state. In addition, frequency-dependent out-of-phase AC magnetic susceptibility signals at low temperature for complexes 1, 2, and 3 are indicative of their single-molecule magnetism behavior.",
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Mixed-metal single-molecule magnets : Syntheses, structure, and magnetic properties of [Mn8Fe4O12(O2CR) 16(H2O)4] (R = CH2Cl, CH 2Br, CHCl2). / Yang, Chen I.; Yang, Shwu Fen; Hung, Shao Po; Lee, Gene Hsiang; Wur, Ching Shuei; Tsai, Hui Lien.

In: Polyhedron, Vol. 30, No. 18, 28.11.2011, p. 2969-2977.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mixed-metal single-molecule magnets

T2 - Syntheses, structure, and magnetic properties of [Mn8Fe4O12(O2CR) 16(H2O)4] (R = CH2Cl, CH 2Br, CHCl2)

AU - Yang, Chen I.

AU - Yang, Shwu Fen

AU - Hung, Shao Po

AU - Lee, Gene Hsiang

AU - Wur, Ching Shuei

AU - Tsai, Hui Lien

PY - 2011/11/28

Y1 - 2011/11/28

N2 - Three mixed-metal single-molecule magnets containing [Mn8Fe 4O12]16+ cores are synthesized and characterized. The reaction of FeCl2·4H2O with KMnO4 and RCOOH (R = CH2Cl, CH2Br) in H 2O gives [Mn8Fe4O12(O 2CR)16(H2O)4] (R = CH2Cl (1), CH2Br (2)) in yields of 43% and 40%, respectively. Treatment of complex 1 with an excess of CHCl2COOH in CH2Cl2 gives [Mn8Fe4O12(O2CCHCl 2)16(H2O)4]·CH 2Cl2·10H2O (3·CH 2Cl2·10H2O) in a yield of 83%. The X-ray structure analysis reveals that all three complexes consist of a trapped-valence dodecanuclear core comprising 4MnIII, 4Fe III, and 4MnIV ions. DC magnetic susceptibility and magnetization measurements indicate that all three complexes exhibit intramolecular antiferromagnetic interaction, resulting in an S = 4 ground state. In addition, frequency-dependent out-of-phase AC magnetic susceptibility signals at low temperature for complexes 1, 2, and 3 are indicative of their single-molecule magnetism behavior.

AB - Three mixed-metal single-molecule magnets containing [Mn8Fe 4O12]16+ cores are synthesized and characterized. The reaction of FeCl2·4H2O with KMnO4 and RCOOH (R = CH2Cl, CH2Br) in H 2O gives [Mn8Fe4O12(O 2CR)16(H2O)4] (R = CH2Cl (1), CH2Br (2)) in yields of 43% and 40%, respectively. Treatment of complex 1 with an excess of CHCl2COOH in CH2Cl2 gives [Mn8Fe4O12(O2CCHCl 2)16(H2O)4]·CH 2Cl2·10H2O (3·CH 2Cl2·10H2O) in a yield of 83%. The X-ray structure analysis reveals that all three complexes consist of a trapped-valence dodecanuclear core comprising 4MnIII, 4Fe III, and 4MnIV ions. DC magnetic susceptibility and magnetization measurements indicate that all three complexes exhibit intramolecular antiferromagnetic interaction, resulting in an S = 4 ground state. In addition, frequency-dependent out-of-phase AC magnetic susceptibility signals at low temperature for complexes 1, 2, and 3 are indicative of their single-molecule magnetism behavior.

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