Regulating the solution structural integrity and slow magnetic relaxation behavior of two Dy6 clusters with a pyridine–triazole ligand†
Abstract
Using the pyridine–triazole based ligand of bis(3-(pyridin-2-yl)-1,2,4-triazol-5-yl)methane (H2L), two hexanuclear dysprosium(III) complexes, [Dy6(μ4-NO3)2 (OAc)6(L)4(DMF)2]·2NO3 (1) and [Dy6(μ3-OH)4(μ2-OH)2(OAc)4(L)4(EtOH)4]·2H2O (2), have been successfully obtained by hydrothermal reaction in different solvents. The crystal structure analysis reveals that the {Dy6} core in 1 is connected by two μ4-NO3− ions, whereas by four μ3-OH− and two μ2-OH− ions in 2. The HRESI-MS (high-resolution electrospray ionization mass spectrum) measurement of 1–2 was recorded. The presence of prominent peaks for the {Dy6} fragment in 1 (m/z, 1354–1380) at different ion-source voltages showed the higher solution stability and structural integrity of the {Dy6} cluster in 1, compared with that in 2. Temperature- and frequency-dependent alternating current (AC) susceptibility measurements of 1–2 in a zero direct current field display only a characteristic feature of single-molecule magnet (SMM) behavior for 2, indicating different magnetic behavior.