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

276 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",

pages = "12983--12990",

journal = "Journal of the American Chemical Society",

issn = "0002-7863",

publisher = "American Chemical Society",

number = "37",

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TY - JOUR

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.

UR - https://www.scopus.com/pages/publications/77956625508

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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