135599 20260217205602.0 doi 10.1039/d4dt00626g sideral 138692 ART-2024-138692 eng Li, Zhen Magnetic properties and magnetocaloric effect of Ln = Dy, Tb carborane-based metal–organic frameworks 2024 Access copy available to the general public Unrestricted We present the synthesis and magneto-thermal properties of carborane-based lanthanide metal–organic frameworks (MOFs) with the formula {[(Ln)3(mCB-L)4(NO3)(DMF)n]·Solv}, where Ln = Dy or Tb, characterized by dc and ac susceptibility, X-ray absorption spectroscopy (XAS), X-ray magnetic circular dichroism (XMCD) and heat capacity measurements. The MOF structure is formed by polymeric 1D chains of Ln ions with three different coordination environments (Ln1, Ln2, Ln3) running along the b-axis, linked by carborane-based linkers thus to provide a 3D structure. Static magnetic measurements reveal that these MOFs behave at low temperature as a system of S* = 1/2 Ising spins, weakly interacting ferromagnetically along the 1D polymeric chain (J*/kB = +0.45 K (+0.5 K) interaction constant estimated for Dy-MOF (Tb-MOF)) and coupled to Ln ions in adjacent chains through dipolar antiferromagnetic interactions. The Dy MOF exhibits slow relaxation of magnetization through a thermally activated process, transitioning to quantum tunneling of the magnetization at low temperatures, while both compounds exhibit field-induced relaxation through a very slow, direct process. The maximum magnetic entropy changes (−ΔSmaxm) for an applied magnetic field change of 2-0 T are 5.71 J kg−1 K−1 and 4.78 J kg−1 K−1, for Dy and Tb MOFs, respectively, while the magnetocaloric effect (MCE) peak for both occurs at T ∼ 1.6 K, approximately double that for the Gd counterpart. info:eu-repo/grantAgreement/ES/DGA-FSE/E12-23R-RASMIA info:eu-repo/grantAgreement/ES/MICINN/PID2022-136892NB-I00 info:eu-repo/grantAgreement/ES/MICINN/PID2022-138492NB-I00 info:eu-repo/semantics/openAccess by-nc https://creativecommons.org/licenses/by-nc/4.0/deed.es 3.3 2024 CHEMISTRY, INORGANIC & NUCLEAR 10 / 43 = 0.233 2024 Q1 T1 0.653 2024 Inorganic Chemistry 2024 Q2 6.0 2024 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Arauzo, Ana Universidad de Zaragoza (orcid)0000-0002-5999-341X Giner Planas, José Bartolomé, Elena 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 53, 21 (2024), 8969-8979 Dalton Trans. Dalton Transactions 1477-9226 3757973 http://zaguan.unizar.es/record/135599/files/texto_completo.pdf Versión publicada 2771059 http://zaguan.unizar.es/record/135599/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:135599 articulos driver 2026-02-17-20:45:06 ARTICLE