149759 20251017144549.0 doi 10.1039/c6tc00919k sideral 106254 ART-2016-106254 eng Bartolome, E. Antiferromagnetic single-chain magnet slow relaxation in the {Tb(alpha-fur)(3)}(n) polymer with non-Kramers ions 2016 Access copy available to the general public Unrestricted We report the synthesis, crystal structure and magnetic properties of a new molecular complex based on a Tb(III) ion supported by 2-furancarboxylic molecules: {Tb(alpha-fur)(3)(H2O)(3)}(n) (alpha-fur = C4H3OCOO). Two slightly different Tb sites (A and B) exist depending on the position of one of the dangling ligands. Ab initio calculations predict that, for both sites, the magnetic ground state is highly anisotropic (g(z)* = 17.8) and consists of a quasi-doublet with a small gap, well isolated from the next excited state. The a-fur ligand forms 1D polymeric chains of Tb ions of the same type (either A or B) running along the c-axis. The crystal structure is formed by the supramolecular stacking along the a-axis of 2D layers containing parallel chains of the same type. Static magnetization and heat capacity measurements show that, magnetically, the system can be modeled as an ensemble of Ising chains of non-Kramers Tb ions with effective spin S-star = 1/2, antiferromagnetically (AF) coupled by a weak intrachain interaction (J(star)/k(B) = -0.135 K). At very low temperatures, the static susceptibility reflects the presence of a 2-4% concentration of defects in the chains. Ac susceptibility measurements at H = 0 performed down to mK temperatures have enabled us to observe the slow relaxation of magnetization through two different pathways. They are assigned to Single-Chain-Magnet (SCM) behavior in two different types of AF chains (A and B), triggered by the existence of defects breaking the chains into segments with short-range order. At temperatures below 0.1 K this mechanism is replaced by individual relaxation of the ions through direct processes. Under the application of a magnetic field the system slowly relaxes by two distinct direct processes, strongly affected by a phonon bottleneck effect. info:eu-repo/grantAgreement/ES/DGA/E98-MOLCHIP info:eu-repo/grantAgreement/ES/DGA/IMANA-E34 info:eu-repo/grantAgreement/ES/MINECO-FSE-FEDER/MAT2014-53921-R info:eu-repo/grantAgreement/ES/MINECO/MAT2011-23791 info:eu-repo/grantAgreement/ES/MINECO/MAT2011-27233-C02-02 info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2015-68204-R info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 5.256 2016 PHYSICS, APPLIED 18 / 147 = 0.122 2016 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 36 / 273 = 0.132 2016 Q1 T1 1.825 2016 Materials Chemistry 2016 Q1 Chemistry (miscellaneous) 2016 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Bartolome, J. Universidad de Zaragoza (orcid)0000-0002-6517-1236 Arauzo, A. Universidad de Zaragoza (orcid)0000-0002-5999-341X Luzon, J. (orcid)0000-0002-9208-0807 Badia, L. Cases, R. Universidad de Zaragoza (orcid)0000-0002-9258-7907 Luis, F. Universidad de Zaragoza (orcid)0000-0001-6284-0521 Melnic, S. Prodius, D. Shova, S. Turta, C. 0 X Universidad de Zaragoza Serv.Gral. Apoyo Investigación Servicios. Div.Caract.Físi.Quí 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 4, 22 (2016), 5038-5050 J. mater. chem. C JOURNAL OF MATERIALS CHEMISTRY C 2050-7526 3944036 http://zaguan.unizar.es/record/149759/files/texto_completo.pdf Postprint 2067920 http://zaguan.unizar.es/record/149759/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:149759 articulos driver 2025-10-17-14:10:53 ARTICLE