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Synthesis and magnetothermal properties of a ferromagnetically coupled NiII–GdIII–NiII cluster.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 2014, Vol. 43 Issue 1, p259-266, 8p
- Publication Year :
- 2014
-
Abstract
- A linear trimeric cluster of molecular formula [Ni<subscript>2</subscript>Gd(L<superscript>-</superscript>)<subscript>6</subscript>](NO<subscript>3</subscript>) (1) (L<superscript>-</superscript> = (C<subscript>14</subscript>H<subscript>12</subscript>NO<subscript>2</subscript>) has been isolated with its structure determined via single crystal X-ray diffraction. Magnetic susceptibility measurements of 1 show that the nickel and gadolinium ions are coupled ferromagnetically, with a ground total spin state (S) of 11/2. Best fit spin Hamiltonian parameters obtained for 1 are J<subscript>1(Ni-Gd)</subscript> = +0.54 cm<superscript>-1</superscript>, g = 2.01. EPR measurements confirm a low magnetic anisotropy (D = -0.135 cm-1) for 1. Heat capacity determination of the magnetocaloric effect (MCE) parameters for 1 shows that the change in magnetic entropy (-ΔS<subscript>m</subscript>) achieves a maximum of 13.74 J kg<superscript>-1</superscript> K<superscript>-1</superscript> at 4.0 K, with the ferromagnetic coupling giving a rapid change in low applied fields, confirming the potential of Gd molecular derivatives as coolants at liquid helium temperature. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 43
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 100078600
- Full Text :
- https://doi.org/10.1039/c3dt52384e