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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >[Li_2(tF-BDC)(DMF)_2]:A New Alkali Metal Salt of Tetrafluoroterephthalic Acid (H_2tF-BDC)
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[Li_2(tF-BDC)(DMF)_2]:A New Alkali Metal Salt of Tetrafluoroterephthalic Acid (H_2tF-BDC)

机译：[Li_2（tF-BDC）（DMF）_2]：新型四氟对苯二甲酸碱金属盐（H_2tF-BDC）

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摘要

The DMF solvate of lithium tetrafluoroterephthalate [Li_2(tF-BDC)(DMF)_2] (H_2tF-BDC = tetrafluoroterephthalic acid) was synthesized and structurally characterized from X-ray single crystal data (Pbcn, Z = 8). Li~+ (CN = 4) is coordinated tetrahedrally by four oxygen atoms of three different tF-BDC~(2-) linkers and one DMF molecule. The LiO_4 tetrahedra are connected by common vertices to chains, which are bridged by tF-BDC~(2-) linkers to form a 2D polymeric unit. The DMF molecules are oriented perpendicular to these polymeric sheets, which are stacked along [100] in an AB fashion and held together by weak van der Waals interactions. Single crystals of [Li_2(tF-BDC)(DMF)_2] were synthesized by precipitation from an ethanol/DMF solvent mixture, but single-phase samples were only obtained by a mechanochemical approach starting from lithium acetate and H_2tF-BDC by adding DMF. The thermal stability of [Li_2(tF-BDC)(DMF)_2] was investigated by DTA/TG measurements. The (endothermic) decomposition starts at 170 ℃ and is followed by a second exothermic decomposition at approx. 300 ℃. The weight losses are in good agreement with a release of DMF and CO_2. LiF is identified in the residue after heating at 500 ℃.
机译：合成了四氟对苯二甲酸锂[DM_2]（H_2tF-BDC =四氟对苯二甲酸）的DMF溶剂化物，并根据X射线单晶数据（Pbcn，Z = 8）对其结构进行了表征。 Li〜+（CN = 4）由三个不同的tF-BDC〜（2-）接头的四个氧原子和一个DMF分子四面体配位。 LiO_4四面体通过共同的顶点连接到链，这些链通过tF-BDC_（2-）接头桥接，形成2D聚合物单元。 DMF分子垂直于这些聚合物片材定向，这些聚合物片材以[AB]的方式沿[100]堆叠，并通过弱的范德华相互作用保持在一起。通过从乙醇/ DMF溶剂混合物中沉淀来合成[Li_2（tF-BDC）（DMF）_2]单晶，但单相样品只能通过机械化学方法从醋酸锂和H_2tF-BDC中加入DMF来获得。 。通过DTA / TG测量研究了[Li_2（tF-BDC）（DMF）_2]的热稳定性。 （吸热）分解在170℃开始，然后在大约750℃进行第二次放热分解。 300℃。重量损失与DMF和CO_2的释放非常吻合。在500℃加热后，在残留物中鉴定出LiF。

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