000149765 001__ 149765
000149765 005__ 20250127155744.0
000149765 0247_ $$2doi$$a10.1039/c9dt02047k
000149765 0248_ $$2sideral$$a116318
000149765 037__ $$aART-2019-116318
000149765 041__ $$aeng
000149765 100__ $$aBartolomé, E.
000149765 245__ $$aHigh relaxation barrier in neodymium furoate-based field-induced SMMs
000149765 260__ $$c2019
000149765 5060_ $$aAccess copy available to the general public$$fUnrestricted
000149765 5203_ $$aTwo new neodymium molecular magnets of formula {Nd(a-fur)3(H2O)2]·DMF}n (1) and {Nd0.065La0.935(a-fur)3(H2O)2]}n (2), a-fur = C4H3OCOO, have been synthesized. In (1) the furoate ligands, in bidentate bridging mode, consolidate zig-zag chains running along the a-direction. Compound (2) is a magnetically diluted complex of a polymeric chain along the b-axis. Heat capacity, dc magnetization and ac susceptibility measurements have been performed from 1.8 K up to room temperature. Ab initio calculations yielded the gyromagnetic factors gx* = 0.52, gy* = 1.03, gz* = 4.41 for (1) and gx* = 1.35, gy* = 1.98, gz* = 3.88 for (2), and predicted energy gaps of ¿/kB = 125.5 K (1) and ¿/kB = 58.8 K (2). Heat capacity and magnetometry measurements agree with these predictions, and confirm the non-negligible transversal anisotropy of the Kramers doublet ground state. A weak intrachain antiferromagnetic interaction J'/kB = -3.15 × 10-3 K was found for (1). No slow relaxation is observed at H = 0, attributed to the sizable transverse anisotropy component, and/or dipolar or exchange interactions enhancing the quantum tunnelling probability. Under an external applied field as small as 80 Oe, two slow relaxation processes appear: above 3 K the first relaxation mechanism is associated to a combination of Orbach process, with a sizeable activation energy U/kB = 121 K at 1.2 kOe for (1), Raman and direct processes; the second, slowest relaxation mechanism is associated to a direct process, affected by phonon-bottleneck effect. For complex (2) a smaller U/kB = 61 K at 1.2 kOe is found, together with larger g*-transversal terms, and the low-frequency process is quenched. The reported complexes represent rare polymeric Nd single-ion magnets exhibiting high activation energies among the scarce Nd(iii) family. © 2019 The Royal Society of Chemistry.
000149765 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E12-R17$$9info:eu-repo/grantAgreement/ES/MINECO/MAT2017-83468-R
000149765 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttp://creativecommons.org/licenses/by-nc/3.0/es/
000149765 590__ $$a4.174$$b2019
000149765 591__ $$aCHEMISTRY, INORGANIC & NUCLEAR$$b5 / 45 = 0.111$$c2019$$dQ1$$eT1
000149765 592__ $$a1.048$$b2019
000149765 593__ $$aInorganic Chemistry$$c2019$$dQ1
000149765 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000149765 700__ $$0(orcid)0000-0002-5999-341X$$aArauzo, A.$$uUniversidad de Zaragoza
000149765 700__ $$0(orcid)0000-0002-9208-0807$$aLuzón, J.
000149765 700__ $$aMelnic, S.
000149765 700__ $$aShova, S.
000149765 700__ $$aProdius, D.
000149765 700__ $$aNlebedim, I. C.
000149765 700__ $$0(orcid)0000-0002-0047-1772$$aBartolomé, F.$$uUniversidad de Zaragoza
000149765 700__ $$0(orcid)0000-0002-6517-1236$$aBartolomé, J.
000149765 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000149765 773__ $$g48, 41 (2019), 15386-15396$$pDalton Trans.$$tDalton Transactions$$x1477-9226
000149765 8564_ $$s4725664$$uhttps://zaguan.unizar.es/record/149765/files/texto_completo.pdf$$yVersión publicada
000149765 8564_ $$s2551373$$uhttps://zaguan.unizar.es/record/149765/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000149765 909CO $$ooai:zaguan.unizar.es:149765$$particulos$$pdriver
000149765 951__ $$a2025-01-27-14:42:53
000149765 980__ $$aARTICLE