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Synthesis and magnetothermal properties of a ferromagnetically coupled Ni-II-Gd-III-Ni-II cluster (Articolo in rivista)

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Synthesis and magnetothermal properties of a ferromagnetically coupled Ni-II-Gd-III-Ni-II cluster (Articolo in rivista) (literal)

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Upadhyay A. [ 1 ] ; Komatireddy N. [ 1 ] ; Ghirri A. [ 2,3 ] ; Tuna F. [ 4,5 ] ; Langley S. K. [ 6 ] ; Srivastava A. K. [ 7 ] ; Sanudo E. C. [ 8 ] ; Moubaraki B. [ 6 ] ; Murray K. S. [ 6 ] ; McInnes E. J. L. [ 4,5 ] ; Affronte M. [ 2,3 ] ; Shanmugam M. [ 1 ] (2014)
Synthesis and magnetothermal properties of a ferromagnetically coupled Ni-II-Gd-III-Ni-II cluster
in Dalton transactions (2003. Print); ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE,, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND (Regno Unito)
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Upadhyay A. [ 1 ] ; Komatireddy N. [ 1 ] ; Ghirri A. [ 2,3 ] ; Tuna F. [ 4,5 ] ; Langley S. K. [ 6 ] ; Srivastava A. K. [ 7 ] ; Sanudo E. C. [ 8 ] ; Moubaraki B. [ 6 ] ; Murray K. S. [ 6 ] ; McInnes E. J. L. [ 4,5 ] ; Affronte M. [ 2,3 ] ; Shanmugam M. [ 1 ] (literal)

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[ 1 ] Indian Inst Technol, Dept Chem, Bombay 400076, Maharashtra, India [ 2 ] Univ Modena & Reggio Emilia, CNR, Inst Nanosci S3, I-41125 Modena, Italy [ 3 ] Univ Modena & Reggio Emilia, Dipartimento Sci Fis Informat & Matemat, I-41125 Modena, Italy [ 4 ] Univ Manchester, EPSRC UK Natl EPR Facil, Sch Chem, Manchester M13 9PL, Lancs, England [ 5 ] Univ Manchester, Photon Sci Inst, Manchester M13 9PL, Lancs, England [ 6 ] Monash Univ, Sch Chem, Clayton, Vic 3800, Australia [ 7 ] Indian Inst Sci Educ & Res, Dept Chem, Pune 411008, Maharashtra, India [ 8 ] Univ Barcelona, Dept Quim Inorgan, E-08028 Barcelona, Spain (literal)

Titolo

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

Abstract

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. (literal)

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