The cover story of the September 22nd<\/sup> issue of The Journal of the American Chemical Society will feature an article from members of our team in collaboration with colleagues at Edinburgh, Berkeley and Columbia. Our work targeted the synthesis of molecular nanomagnets for enhanced magnetic refrigeration and the experimental verification of the relevant role played by the anisotropy in setting the performance of these coolers.<\/p>\n\n\n\n The use of methylene-bridged calix[4]arenes in 3d\/4f chemistry produces a family of clusters of formula [MnIII<\/sup>4<\/sub>LnIII<\/sup>4<\/sub>], where MnIII<\/sup> is a manganese ion and LnIII<\/sup> a lanthanide ion. The molecular structure describes a square of LnIII<\/sup> ions housed within a square of MnIII<\/sup> ions. The anisotropy induced by setting LnIII<\/sup> to be terbium or dysprosium ions results in (i) superparamagnetic behaviour of [MnIII<\/sup>4<\/sub>TbIII<\/sup>4<\/sub>] or [MnIII<\/sup>4<\/sub>DyIII<\/sup>4<\/sub>], respectively, with blocking temperatures in the temperature region below 1 K and (ii) poor performance of these clusters in terms of magnetic refrigeration. However, the replacement of the anisotropic terbium or dysprosium ions with the isotropic gadolinium ions results in a large number of molecular spin states that are populated even at the lowest investigated temperatures, while the ferromagnetic limit S<\/em> = 22 is being approached only at the highest applied fields. This, combined with the high magnetic isotropy, makes [MnIII<\/sup>4<\/sub>GdIII<\/sup>4<\/sub>] an excellent magnetic refrigerant for low-temperature applications, providing for example a valid alternative to the use of 3<\/sup>He which is becoming rare and expensive.<\/p>\n\n\n\n Link to https:\/\/dx.doi.org\/10.1021\/ja104848m<\/a>.<\/p>\n\n\n\n Also highlighted<\/strong> by the European Institute of Molecular Magnetism, SINC<\/a>, madri+d<\/a>, La Catedral Innova, Plica Zarag\u00f3zame, Ecoticias, CTNoticias, RDi Press, Technology for life, La Flecha, Keegy, Black Capital<\/a>, EveryDay Science, Bitacoras, Energium, Notas de ciencia, Ruoleima, Arag\u00f3n Investiga<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" Molecular coolers get JACS cover story The cover story of the September 22nd issue of The Journal of the American Chemical Society will feature an article from members of our team in collaboration with colleagues at Edinburgh, Berkeley and Columbia. Our work targeted the synthesis of molecular nanomagnets for enhanced magnetic refrigeration and the experimental<\/p>\n