4.3 Article

The Synthesis, Crystal Structure, and Magnetic Properties of Mono-Scorpionate Eu(III) Complexes

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INORGANICS
卷 11, 期 10, 页码 -

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MDPI
DOI: 10.3390/inorganics11100418

关键词

europium(III) complexes; scorpionate; tripodal ligand; trispyrazolylmethane; tris(3,5-dimethyl-1-pyrazolyl)methane; magnetic properties; spin-orbit coupling

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Three Eu3+ complexes with predictable coordination modes have been obtained and studied. The magnetic properties of these complexes can be described using a simple Van Vleck formula. The stereochemical analysis of the coordination environment shows that these complexes can be used as diamagnetic model systems to study the crystal field effects.
Three Eu3+ complexes containing a neutral tripodal ligand possessing a predictable coordination mode have been obtained and studied. The trispyrazolylmethane complexes have an aqua ligand in the coordination sphere, forming both the mononuclear species [Eu(HCPz3)H2O(NO3)3] and the dimer [Eu(HCPz3)H2O(CF3SO3)3]2, having a Chinese lantern structure, whereas the use of the methylated tripod leads to the water-free complex, [Eu(HC(PzMe2)3)(NO3)3]. A qualitative analysis of the magnetic susceptibility of polycrystalline samples demonstrated that the magnetic properties can be described using a simple Van Vleck formula with spin-orbit coupling parameter (lambda = 383 divided by 406 cm-1) close to the values for free Eu3+ ions. The stereochemical analysis of the coordination environment of [Ln(HC(PzMe2)3)(NO3)3] has shown that these complexes can be used as diamagnetic model systems to obtain information on the crystal field effects in the paramagnetic monoradical complexes, [LnRad(NO3)3], since both types of compounds have the same type of coordination polyhedron (symmetry point group D3h) and very close Ln-donor atom distances.

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