doi:10.3389/fchem.2024.1494609engAgapaki, EleftheriaCharkiolakis, Emmanouil K.Nichol, Gary S.Gracia, DavidEvangelisti, MarcoBrechin, Euan K.Magnetocaloric effect in a high-spin ferromagnetic molecular clusterART-2024-140722The reaction of MnCl2·4H2O with HL ((1-methyl-1H-imidazol-2-yl)methanol) and pdH2 (1, 3 propanediol) in a basic MeCN solution results in the formation of a mixed-valence [Mn20] cationic cluster and two [MnIICl4] counter anions. The metallic skeleton of the cluster describes two geometrically equivalent mixed-valent, linked [MnIII6MnII4] supertetrahedra in which nearest-neighbor metal ions have a different oxidation state. Magnetic susceptibility, magnetization data and heat capacity measurements support evidence of predominant ferromagnetic correlations, leading to a s = 22 spin ground state for the [MnIII6MnII4] supertetrahedra, which are pair-linked by a weak antiferromagnetic coupling. The properties are discussed in the context of the magnetocaloric effect and the potential application of this compound in cryogenic refrigeration.2024http://zaguan.unizar.es/record/14690210.3389/fchem.2024.1494609http://zaguan.unizar.es/record/146902oai:zaguan.unizar.es:146902info:eu-repo/grantAgreement/ES/DGA/E11-23Rinfo:eu-repo/grantAgreement/ES/DGA-FSE/E12-23R-RASMIAinfo:eu-repo/grantAgreement/ES/MICINN/PID2021-124734OB-C21Frontiers in Chemistry 12 (2024), 1494609 [8 pp.]byhttps://creativecommons.org/licenses/by/4.0/deed.esinfo:eu-repo/semantics/openAccess