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首页> 外文期刊>Chemistry: A European journal >Sr[C_2(COO)_2]: The First Anhydrous Salt of Acetylenedicarboxylic Acid
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Sr[C_2(COO)_2]: The First Anhydrous Salt of Acetylenedicarboxylic Acid

机译：Sr [C_2（COO）_2]：乙炔二羧酸的第一种无水盐

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摘要

Single crystals of Sr[C_2(COO)_2] were formed at the phase boundary of an aqueous silica gel that contained acetylenedicarboxylic acid and an aqueous solution of SrCl_2. The crystal structure (I4_1/amd, Z = 4) shows a diamond-like topology, with the strontium ions is an eightfold co-ordination by the oxygen atoms of six carboxylate ligands with two of them co-ordinating in a chelating-type bidentate mode. As each oxygen atom of the carboxylate groups is involved in both a chelating-type bidentate and unidentate co-ordination and, therefore, bridging two strontium atoms, a three-dimensional framework results. Sr[C_2(COO)_2] exhibits a surprising thermal stability. In air decomposition starts at about 720 K and in an argon atmosphere around 750 K. This decomposition is accompanied by a mass loss of approximately 12%, which is probably due to the loss of one CO molecule. The resulting residue is amorphous to X-rays. A small negative thermal expansion is found between 30 and 280 K, whereas between room temperature and 573 K almost no thermal expansion is observed. Single-crystal investigations at different temperatures show a strong "guitar string" vibration of the oxygen atom perpendicular to the contacts to the strontium atoms; this could be responsible for the thermal expansion behaviour.
机译：在含有乙炔二羧酸和SrCl_2水溶液的水性硅胶的相界处形成了Sr [C_2（COO）_2]单晶。晶体结构（I4_1 / amd，Z = 4）显示出菱形拓扑，锶离子是六个羧酸盐配体的氧原子的八倍配位，其中两个以螯合型二齿配位模式。由于羧酸根基团的每个氧原子都参与螯合型双齿和不对称配位，因此桥接两个锶原子，因此形成了三维框架。 Sr [C_2（COO）_2]表现出令人惊讶的热稳定性。在空气中的分解开始于大约720 K，在氩气中的分解大约在750K。这种分解伴随着大约12％的质量损失，这可能是由于一个CO分子的损失。所得的残余物对X射线是无定形的。在30 K和280 K之间发现一个小的负热膨胀，而在室温和573 K之间几乎没有观察到热膨胀。在不同温度下进行的单晶研究表明，垂直于锶原子接触的氧原子有强烈的“吉他弦”振动。这可能是热膨胀行为的原因。

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