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The quest for rationalizing the magnetism in purely organic semiquinone-bridged bisdithiazolyl molecular magnets Fumanal Quintana, María Deumal i Solé, Mercè Magnetisme Radicals (Química) Compostos orgànics Magnetism Radicals (Chemistry) Organic compounds Semiquinone-bridged bisdithiazolyl-based radicals (XBBO) are appealing purely organic magnetic building blocks for the synthesis of new functional materials. Remarkably, for the phenyl-derivative PhBBO, the rationalization of its magnetism becomes a proof of concept that DFT can dramatically fail to evaluate JAB magnetic interactions between purely organic radical pairs. Instead, wavefunction-based methods are required. Once JAB's are fully characterized, the magnetic topology of PhBBO is disclosed to consist of ferromagnetic FM π-stacks that are very weakly coupled (by FM and AFM JAB interactions). The magnetic susceptibility χT(T) and magnetization M(H) of PhBBO are then calculated using a first-principles bottom-up approach. The study of the unit cell contraction upon cooling from room temperature to zero-Kelvin is relevant to propose a suitable model for the phase transition that occurs at 4.5 K. A simplistic picture tells us that the antiparallel-aligned 1D-FM-chains convert into domains of weakly either FM- or AFM-coupled 1D-FM-chains. Accordingly, the presence of these domains may introduce geometrical spin frustration below 4.5 K. 2017-12-22T09:01:16Z 2017-12-22T09:01:16Z 2016-08-14 2017-12-22T09:01:16Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1039/c6cp02699k Physical Chemistry Chemical Physics, 2016, vol. 18, num. 30, p. 20738-20749 https://doi.org/10.1039/c6cp02699k cc-by (c) Fumanal Quintana, María et al., 2016 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess Royal Society of Chemistry Articles publicats en revistes (Ciència dels Materials i Química Física)