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Synthesis and magnetothermal properties of a ferromagnetically coupled Ni-II-Gd-III-Ni-II cluster

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Title Synthesis and magnetothermal properties of a ferromagnetically coupled Ni-II-Gd-III-Ni-II cluster
 
Creator UPADHYAY, A
KOMATIREDDY, N
GHIRRI, A
TUNA, F
LANGLEY, SK
SRIVASTAVA, AK
SANUDO, EC
MOUBARAKI, B
MURRAY, KS
MCINNES, EJL
AFFRONTE, M
SHANMUGAM, M
 
Subject SINGLE-MOLECULE MAGNETS
COORDINATION POLYMERS
GROUND-STATE
METAL-IONS
CU-II
CO-II
COMPLEXES
SPIN
LN
TB
 
Description A linear trimeric cluster of molecular formula [Ni2Gd(L-)(6)](NO3) (1) (L- = (C14H12NO2) 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(1(Ni-Gd)) = + 0.54 cm(-1), 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 (-Delta S-m) 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 ROYAL SOC CHEMISTRY
 
Date 2014-12-28T12:10:42Z
2014-12-28T12:10:42Z
2014
 
Type Article
 
Identifier DALTON TRANSACTIONS, 43(1)259-266
1477-9226
1477-9234
http://dx.doi.org/10.1039/c3dt52384e
http://dspace.library.iitb.ac.in/jspui/handle/100/16455
 
Language English