Lanthanide-based bis-(3,5-dicarboxy-phenyl)terephthalamide metal–organic frameworks: slow relaxation of magnetization and detection of trace Fe2+ and Fe3+,New Journal of Chemistry

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Lanthanide-based bis-(3,5-dicarboxy-phenyl)terephthalamide metal–organic frameworks: slow relaxation of magnetization and detection of trace Fe2+ and Fe3+
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2021-3-19 , DOI: 10.1039/d1nj00863c
Qingfang Lin _{1,

2,

3,

4} , Wen Xie _{1,

2,

3,

4} , Zhihui Zong _{1,

2,

3,

4} , Zicheng Liu _{1,

2,

3,

4} , Yuqing Sun _{1,

2,

3,

4} , Lili Liang _{1,

2,

3,

4}

Affiliation

Solvothermal reactions of flexible aromatic linker bis(3,5-dicarboxyphenyl)terephthalamide (H₄BDPT) with dysprosium and samarium salts yield two Ln-based metal–organic frameworks {[Dy₂(BDPT)_1.5(DMF)₄]·H₂O}_n (1) and [Sm₂(BDPT)_1.5(DMF)₄]_n (2) with inserted acylamide groups. Both 1 and 2 possess a 3D open framework built from 6-connecting Ln2 clusters and 4-connecting tetracarboxylate ligands. There are small 1-D helical channels in the structure occupying 29.8% of the framework. Magnetic measurements reveal that compound 1 exhibits weak antiferromagnetic interactions between Dy³⁺ ions and a distinct slow relaxation phenomenon. The frequency-dependent ac susceptibility results reveal that 1 exhibits an χ_M′′ ac signal with observable maxima under 1500 Oe, indicating the signature of SMM behavior with the anisotropic barrier of 25 K and the pre-exponential factor τ₀ 5.0 × 10⁻⁷ s. Furthermore, both 1 and 2 serve as fluorescent probes for selectively detecting trace Fe²⁺ and Fe³⁺ through the luminescence emission quenching effect, with the detection limit of 1.03 × 10⁻⁷ and 2.14 × 10⁻⁷ M⁻¹ for Fe²⁺, respectively.

中文翻译：

基于镧系元素的双-（3,5-二羧基-苯基）对苯二甲酰胺金属-有机骨架：磁化的缓慢弛豫和痕量Fe2 +和Fe3 +的检测

柔性芳族连接基双（3,5-二羧基苯基）对苯二甲酰胺（H ₄ BDPT）与和sa盐的溶剂热反应产生两个基于Ln的金属有机骨架{[Dy ₂（BDPT）_1.5（DMF）₄ ]·H ₂具有插入的酰胺基的O} _n（1）和[Sm ₂（BDPT）_1.5（DMF）₄ ] _n（2）。既1和2拥有一个由6个连接的Ln2簇和4个连接的四羧酸酯配体构建的3D开放框架。结构中存在小的一维螺旋通道，占框架的29.8％。磁性测量表明，化合物1在Dy ³⁺离子之间显示出弱的反铁磁相互作用，并且具有明显的缓慢弛豫现象。依赖于频率的交流磁化率结果表明，1只显示出一个χ_中号“”的交流信号与可观察到的最大值下1500奥斯特，指示与25 K的各向异性屏障和预指数因子的SMM行为签名τ ₀ 5.0×10 ^{- 7}秒此外，1和2作为荧光探针，用于选择性地检测微量Fe ²⁺和Fe ³⁺通过发光发射猝灭效应，具有1.03×10的检测极限^-7和2.14×10 ^-7中号^-1为铁²⁺，分别。

更新日期：2021-04-12

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