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Synthesis and magnetothermal properties of a ferromagnetically coupled NiII–GdIII–NiII cluster†

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Title Synthesis and magnetothermal properties of a ferromagnetically coupled NiII–GdIII–NiII cluster†
 
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
 
Subject MAGNETISM
MAGNETOCALORIC EFFECT
EPR
SCHIFF BASE
GADOLINIUM
NICKEL
 
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.
 
Publisher RSC PUBLISHING
 
Date 2013-12-12T06:33:33Z
2013-12-12T06:33:33Z
2013-09
 
Type Article
 
Identifier Dalton Trans. , 2014, 43, 259-266
1364-5447
0300-9246
http://dspace.library.iitb.ac.in/jspui/handle/100/14419
 
Language en