Synthesis and magnetothermal properties of a ferromagnetically coupled NiII–GdIII–NiII cluster†
DSpace at IIT Bombay
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Title |
Synthesis and magnetothermal properties of a ferromagnetically coupled NiII–GdIII–NiII cluster†
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Creator |
UPADHYAY, APOORVA
KOMATIREDDY, NAVATHA ALBERTO, GHIRRI TUNA, FLORIANA LANGLEY, STUART K. SRIVASTAVA, ANANT K. SAÑUDO, E. CAROLINA MOUBARAKI, BOUJEMAA MURRAY, KEITH S. MCINNES, ERIC J. L. AFFRONTE, MARCO SHANMUGAM, MAHESWARAN |
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Subject |
MAGNETISM
MAGNETOCALORIC EFFECT EPR SCHIFF BASE GADOLINIUM NICKEL |
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Description |
A linear trimeric cluster of molecular formula [Ni2Gd(L(-))6](NO3) () (L(-) = (C14H12NO2) has been isolated with its structure determined via single crystal X-ray diffraction. Magnetic susceptibility measurements of 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 are J1(Ni-Gd) = +0.54 cm(-1), g = 2.01. EPR measurements confirm a low magnetic anisotropy (D = -0.135 cm(-1)) for . Heat capacity determination of the magnetocaloric effect (MCE) parameters for shows that the change in magnetic entropy (-ΔSm) achieves a maximum of 13.74 J kg(-1) K(-1) 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.
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Publisher |
RSC PUBLISHING
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Date |
2013-12-12T06:33:33Z
2013-12-12T06:33:33Z 2013-09 |
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Type |
Article
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Identifier |
Dalton Trans. , 2014, 43, 259-266
1364-5447 0300-9246 http://dspace.library.iitb.ac.in/jspui/handle/100/14419 |
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Language |
en
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