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Magnetism Studies of Bis(acyl)phosphide-Supported Eu3+ and Eu2+ Complexes
Ju Chen1, Stephanie H Carpenter2, Taylor V Fetrow2
1Department of Chemistry and Chemical Biology, The University of New Mexico, Albuquerque, New Mexico87131, United States.
Abstract:
A series of bis(acyl)phosphide-supported Eu complexes were synthesized (bis(acyl)phosphide = BAP). In this study, BAP ligands proved to be excellent ligands for the synthesis of both Eu3+ and Eu2+ molecular complexes. Sodium bis(mesitoyl)phosphide (Na(BAP)) and sodium bis(2,4,6-triisopropylbenzoyl)phosphide (Na(BAP)) were employed as ligand precursors for the synthesis of the Eu3+ complexes Eu(bis(mesitoyl)phosphide)3(thf)2 (Eu(BAP)(thf)) and Eu(bis(2,4,6-triisopropylbenzoyl)phosphide)3 (Eu(BAP)), as well as the Eu2+ complex, Eu(bis(2,4,6-triisopropylbenzoyl)phosphide)2(dme)2 (Eu(BAP)(dme)) (thf = tetrahydrofuran, dme = 1,2-dimethoxyethane). All complexes were characterized using a combination of UV-vis-NIR-IR and NMR spectroscopies, and single-crystal X-ray diffraction (SC-XRD). The magnetic properties of these three monomeric Eu complexes were investigated by variable-temperature magnetic susceptibility. The magnetic data are typical for these ions, with Eu(BAP)(dme) displaying Curie-type behavior. Both Eu(BAP) and Eu(BAP)(thf) possess similar 7F0-7F1 spin-orbit energy gaps and a similar zero-field splitting of the 7F1 state.
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