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Determining the Effects of Zero-Field Splitting and Magnetic Exchange in Dimeric Europium(II) Complexes.
Inorganic Chemistry 2024 April 27
Related BAP [BAP = bis(acyl)phosphide] and Acac (Acac = β-diketonate) molecules perform as robust supports for both lanthanide and actinide metals. Here, a molecular bimetallic Eu2+ complex was successfully targeted and isolated by employing sodium bis(mesitoyl)phosphide [Na(mes BAP)] in a salt metathesis with EuI2 , producing [Eu( mes BAP) 2 (et 2 o)] 2 (et2 o = metal-coordinated diethyl ether). The corresponding Acac-Eu2+ complex was targeted using mes Acac- (1,3-dimesityl-1,3-propanedione), generating [Eu( mes Acac) 2 (et 2 o)] 2 . Both complexes were characterized by single-crystal X-ray diffraction, UV-vis, IR, and NMR spectroscopies, and variable-temperature magnetic susceptibility. [Eu( mes BAP) 2 (et 2 o)] 2 was persistent under anaerobic, anhydrous conditions, whereas the analogous [Eu( mes Acac) 2 (et 2 o)] 2 showed evidence of decomposition under identical conditions. Variable-temperature magnetic susceptibility and magnetization studies of [ Eu( mes BAP) 2 (et 2 o)] 2 and [Eu( mes Acac) 2 (et 2 o)] 2 were performed, resulting in similar magnetic exchange coupling values of J ex = -0.018 and -0.023 cm-1 and axial zero-field-splitting D values of -0.38 and -0.51 cm-1 , respectively.
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