4 years ago

Two structural analogous TbIII-indazole-radical complexes with different dynamic magnetic behaviors

Two structural analogous TbIII-indazole-radical complexes with different dynamic magnetic behaviors
The combination of TbIII ion with two different indazole nitronyl nitroxide radicals resulted in two novel 2p-4f compounds, namely, [Tb(hfac)3(5-IndazoleNIT)]2 (1) (hfac=hexafluoroacetylacetone; 5-IndazoleNIT=5-(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl- 4,5-hydro-1H-imidazol-2-yl)-1H-indazole) and [Tb(hfac)3(6-IndazoleNIT)]2 (2) (6-IndazoleNIT=6-(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl- 4,5-hydro-1H-imidazol-2-yl)-1H-indazole). Single crystal X-ray diffraction studies revealed that compound 1 was binuclear complex, in which each 5-IndazoleNIT molecular acted as a bridging ligand linking two LnIII ions through its oxygen atom of the NO group and nitrogen atom of the indazole ring to form a cyclic four-spin system. Complex 2 exhibited analogous binuclear cyclic four-spin systems with different space group. Compound 1 was found to take on slow relaxation of the magnetization, suggesting single-molecule magnet (SMM) behavior, while no ac signal is noticed for compound 2. The different magnetic relaxation behaviors between 1 and 2 are due to the different location of the radical in the indazole ring. It is demonstrated that the location of the radical in the indazole ring played an important role in determining the spin dynamic for the lanthanide-radical system.

Publisher URL: www.sciencedirect.com/science

DOI: S1387700317306743

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