61699 20190709135443.0 doi 10.1039/c6sc04737h sideral 99161 ART-2017-99161 eng (orcid)0000-0002-8424-9780 Urtizberea, A. Switchable slow relaxation of magnetization in the native low temperature phase of a cooperative spin-crossover compound 2017 Access copy available to the general public Unrestricted The implementation of single-molecule magnet properties in spin crossover materials is sought as a unique source of magnetic multistability at the molecular level. Examples however remain extremely scarce, in part due to the diamagnetic state of most Fe(ii) spin crossover materials at low temperatures. We have studied the complex [Fe(mtz)6](CF3SO3)2 (mtz = 1-methyltetrazole) as a tantalizing candidate of such coexistence, due to its known partial spin crossover and therefore paramagnetic native low temperature phase. The single-crystal structures of [Fe(mtz)6](CF3SO3)2 reported here allow rationalizing its peculiar cooperative spin-crossover behavior. Importantly, the high-spin Fe crystallographic sites at low temperature exhibit a high symmetry with a local trigonal distortion, usually source of magnetic anisotropy. The analysis of equilibrium magnetic properties confirm the presence of a significant magnetic anisotropy at the Fe(ii) high spin sites in the high symmetry low temperature phase. This results in field-induced slow relaxation of their magnetization which is dominated at low temperature by tunneling and direct processes and is strongly enhanced above 3 K by Raman and Orbach processes. Unprecedentedly, these single-molecule magnet properties are observed in the native ground state of a spin crossover material and efficiently and reversibly switched OFF through visible light irradiation. info:eu-repo/grantAgreement/ES/DGA/E98-MOLCHIP info:eu-repo/grantAgreement/ES/MINECO/MAT2014-53961-R info:eu-repo/grantAgreement/ES/MINECO/MAT2015-70868-ERC info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 9.063 2017 CHEMISTRY, MULTIDISCIPLINARY 18 / 171 = 0.105 2017 Q1 T1 4.508 2017 Chemistry (miscellaneous) 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0003-2095-5843 Roubeau, O. Universidad de Zaragoza 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 8, 3 (2017), 2290-2295 Chem. sci. CHEMICAL SCIENCE 2041-6520 988604 http://zaguan.unizar.es/record/61699/files/texto_completo.pdf Versión publicada 120466 http://zaguan.unizar.es/record/61699/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:61699 articulos driver 2019-07-09-11:37:18 ARTICLE