Details

Autor(en) / Beteiligte

• Brunet, Gabriel
• Habib, Fatemah
• Korobkov, Ilia
• Murugesu, Muralee

Titel

Slow Magnetic Relaxation Observed in Dysprosium Compounds Containing Unsupported Near-Linear Hydroxo- and Fluoro-Bridges

Ist Teil von

• Inorganic chemistry, 2015-07, Vol.54 (13), p.6195-6202

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The encapsulating N1,N3-bis­(3-methoxysalicylidene)­diethylenetriamine (H2valdien) ligand was employed to isolate two novel DyIII compounds which contain rare bridging pathways for lanthanide systems. Compound 1, [Na2DyIII 2(valdien)2(μ-OH)­(dbm)2(H2O)2]­[Na2DyIII 2(valdien)2(μ-OH)­(NO3)2(dbm)2], where dbm– is dibenzoylmethanido, and compound 2, [Na3DyIII 2(valdien)2(μ-F)­(μ3-F)2­(Cl)2(MeOH)2] n ·0.5­(MeOH)·(H2O), both exhibit linear lone hydroxo- and fluoro-bridges, respectively, between the metal centers. The unit cell of 1 comprises two discrete dinuclear molecules, which differ slightly, forming a cation–anion pair, while 2 forms a coordination polymer. The magnetic investigations indicate that both compounds display ferromagnetic coupling between the DyIII ions. Magnetic susceptibility measurements in the temperature range 1.8–300 K reveal that the DyIII ions in 1 are weakly coupled, resulting in a mononuclear single-molecule magnet-like behavior under an applied field. In the case of 2, the stronger coupling arising from the fluoride-bridge, leads to zero-field single-molecule magnet (SMM) behavior with a non-negligible anisotropy barrier (U eff) of 42 K.