Calix[4]arene clusters as enhanced magnetic coolers and molecular magnets

Georgios Karotsis; Stuart Kennedy; Simon J. Teat; Christine M. Beavers; Drew A. Fowler; Juan J. Morales; Marco Evangelisti; Scott J. Dalgarno; Euan K. Brechin

doi:10.1021/ja104848m

Calix[4]arene clusters as enhanced magnetic coolers and molecular magnets

Georgios Karotsis, Stuart Kennedy, Simon J. Teat, Christine M. Beavers, Drew A. Fowler, Juan J. Morales, Marco Evangelisti, Scott J. Dalgarno, Euan K. Brechin

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

269 Citations (Scopus)

Abstract

The use of methylene-bridged calix[4]arenes in 3d/4f chemistry produces a family of clusters of general formula [Mn^III₄Ln ^III₄(OH)₄(C4)₄(NO₃) ₂(DMF)₆(H₂O)₆](OH)₂ (where C4 = calix[4]arene; Ln = Gd (1), Tb (2), Dy (3)). The molecular structure describes a square of Ln^III ions housed within a square of Mn ^III ions. Magnetic studies reveal that 1 has a large number of molecular spin states that are populated even at the lowest investigated temperatures, while the ferromagnetic limit S = 22 is being approached only at the highest applied fields. This, combined with the high magnetic isotropy, makes the complex an excellent magnetic refrigerant for low-temperature applications. Replacement of the isotropic Gd^III ions with the anisotropic Tb^III and Dy^III ions "switches" the magnetic properties of the cluster so that 2 and 3 behave as low-temperature molecular magnets, displaying slow relaxation of the magnetization. © 2010 American Chemical Society.

Original language	English
Pages (from-to)	12983-12990
Number of pages	8
Journal	Journal of the American Chemical Society
Volume	132
Issue number	37
DOIs	https://doi.org/10.1021/ja104848m
Publication status	Published - 22 Sept 2010

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@article{dc7d6b3d53ec41628b5841c99cb0770c,

title = "Calix[4]arene clusters as enhanced magnetic coolers and molecular magnets",

abstract = "The use of methylene-bridged calix[4]arenes in 3d/4f chemistry produces a family of clusters of general formula [MnIII4Ln III4(OH)4(C4)4(NO3) 2(DMF)6(H2O)6](OH)2 (where C4 = calix[4]arene; Ln = Gd (1), Tb (2), Dy (3)). The molecular structure describes a square of LnIII ions housed within a square of Mn III ions. Magnetic studies reveal that 1 has a large number of molecular spin states that are populated even at the lowest investigated temperatures, while the ferromagnetic limit S = 22 is being approached only at the highest applied fields. This, combined with the high magnetic isotropy, makes the complex an excellent magnetic refrigerant for low-temperature applications. Replacement of the isotropic GdIII ions with the anisotropic TbIII and DyIII ions {"}switches{"} the magnetic properties of the cluster so that 2 and 3 behave as low-temperature molecular magnets, displaying slow relaxation of the magnetization. {\textcopyright} 2010 American Chemical Society.",

author = "Georgios Karotsis and Stuart Kennedy and Teat, {Simon J.} and Beavers, {Christine M.} and Fowler, {Drew A.} and Morales, {Juan J.} and Marco Evangelisti and Dalgarno, {Scott J.} and Brechin, {Euan K.}",

year = "2010",

month = sep,

day = "22",

doi = "10.1021/ja104848m",

language = "English",

volume = "132",

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T1 - Calix[4]arene clusters as enhanced magnetic coolers and molecular magnets

AU - Karotsis, Georgios

AU - Kennedy, Stuart

AU - Teat, Simon J.

AU - Beavers, Christine M.

AU - Fowler, Drew A.

AU - Morales, Juan J.

AU - Evangelisti, Marco

AU - Dalgarno, Scott J.

AU - Brechin, Euan K.

PY - 2010/9/22

Y1 - 2010/9/22

N2 - The use of methylene-bridged calix[4]arenes in 3d/4f chemistry produces a family of clusters of general formula [MnIII4Ln III4(OH)4(C4)4(NO3) 2(DMF)6(H2O)6](OH)2 (where C4 = calix[4]arene; Ln = Gd (1), Tb (2), Dy (3)). The molecular structure describes a square of LnIII ions housed within a square of Mn III ions. Magnetic studies reveal that 1 has a large number of molecular spin states that are populated even at the lowest investigated temperatures, while the ferromagnetic limit S = 22 is being approached only at the highest applied fields. This, combined with the high magnetic isotropy, makes the complex an excellent magnetic refrigerant for low-temperature applications. Replacement of the isotropic GdIII ions with the anisotropic TbIII and DyIII ions "switches" the magnetic properties of the cluster so that 2 and 3 behave as low-temperature molecular magnets, displaying slow relaxation of the magnetization. © 2010 American Chemical Society.

AB - The use of methylene-bridged calix[4]arenes in 3d/4f chemistry produces a family of clusters of general formula [MnIII4Ln III4(OH)4(C4)4(NO3) 2(DMF)6(H2O)6](OH)2 (where C4 = calix[4]arene; Ln = Gd (1), Tb (2), Dy (3)). The molecular structure describes a square of LnIII ions housed within a square of Mn III ions. Magnetic studies reveal that 1 has a large number of molecular spin states that are populated even at the lowest investigated temperatures, while the ferromagnetic limit S = 22 is being approached only at the highest applied fields. This, combined with the high magnetic isotropy, makes the complex an excellent magnetic refrigerant for low-temperature applications. Replacement of the isotropic GdIII ions with the anisotropic TbIII and DyIII ions "switches" the magnetic properties of the cluster so that 2 and 3 behave as low-temperature molecular magnets, displaying slow relaxation of the magnetization. © 2010 American Chemical Society.

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U2 - 10.1021/ja104848m

DO - 10.1021/ja104848m

M3 - Article

SN - 0002-7863

VL - 132

SP - 12983

EP - 12990

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 37

ER -

Calix[4]arene clusters as enhanced magnetic coolers and molecular magnets

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