| Literature DB >> 24100508 |
Apoorva Upadhyay1, Navatha Komatireddy, Alberto Ghirri, Floriana Tuna, Stuart K Langley, Anant K Srivastava, E Carolina Sañudo, Boujemaa Moubaraki, Keith S Murray, Eric J L McInnes, Marco Affronte, Maheswaran Shanmugam.
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 (-ΔS(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.Entities:
Year: 2014 PMID： 24100508 DOI： 10.1039/c3dt52384e
Source DB: PubMed Journal: Dalton Trans ISSN： 1477-9226 Impact factor: 4.390