Abstract
Two new three-dimensional lanthanide frameworks [Ln(BTB)(H2O)]n (Ln = Eu (1) and Dy (2)) based on 1,3,5-benzenetribenzoic acid (H3BTB) were synthesized and characterized. Structural analysis reveals that they were isostructural, in which two lanthanide ions are bridged by four carboxylic groups from different BTB3− in the modes of μ2-η1η1 and μ2-η1η2 to form a binuclear unit. The binuclear units are built into one-dimensional chain via two μ2-η1η1 carboxylic groups, which are further linked by BTB3− to generate three-dimensional frameworks. Compound 1 displays excellent solvent stability. The luminescent investigations suggest that 1 exhibits high sensitive sensing to aniline. Importantly, 1 as a promising luminescent detector for aniline can be recycled at least for four times. Additionally, magnetic studies reveal that 2 displays slow magnetic relaxation behaviors with the energy barrier (ΔE/kB) of 9.36 K under an external dc field (dc = 2500 Oe).
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