聚[二μ-溴-（μ-2,5-二甲基吡嗪）镉（II）]的合成、晶体结构和热性能

IF 0.5 Q4 CRYSTALLOGRAPHY

Acta Crystallographica Section E: Crystallographic Communications Pub Date : 2025-01-01 DOI:10.1107/S2056989024011824

Christian Näther

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引用次数: 0

摘要

用溴化镉与2,5-二甲基吡嗪在水中反应制备了标题化合物[CdBr2(C6H8N2)] n。它的不对称单元由一个Cd阳离子和一个2,5-二甲基吡嗪配体组成，它们位于晶体镜像平面上，还有一个溴离子占据一般位置。Cd阳离子与4个溴离子和2个2,5-二甲基吡嗪配体在略微扭曲的反式cdbr4n2八面体中进行6倍配位。阳离子通过对桥接溴阴离子连接成[100]链，溴阴离子通过桥接2,5-二甲基吡嗪配体进一步连接成（001）层。粉末x射线衍射（PXRD）表明，得到了纯晶相。热重法和差热分析（TG-TDA）表明，2,5-二甲基吡嗪配体在两个单独的步骤中被去除，形成一种化合物，其组成为（CdBr2）2（2,5-二甲基吡嗪），该化合物在进一步加热后分解成CdBr2。对第一次失重后得到的残渣的PXRD测量表明，形成了新的结晶相。

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Synthesis, crystal structure and thermal properties of poly[di-μ-bromido-(μ-2,5-dimethylpyrazine)cadmium(II)]

In the title compound, the cadmium cations are octahedrally coordinated by four bromide anions and two 2–5-dimethylpyrazine ligands and linked into chains via pairs of μ-1,1-bridging Br⁻ anions that are further connected into layers by the bridging 2,5-dimethylpyrazine coligands.

The title compound, [CdBr₂(C₆H₈N₂)]_n, was prepared by the reaction of cadmium bromide with 2,5-dimethylpyrazine in water. Its asymmetric unit consists of one Cd cation and one 2,5-dimethylpyrazine ligand that are located on a crystallographic mirror plane as well as one bromide anion that occupies a general position. The Cd cations are sixfold coordinated by four bromide anions and two 2,5-dimethylpyrazine ligands within slightly distorted trans-CdBr₄N₂ octahedra. The cations are linked into [100] chains via pairs of bridging bromide anions that are further connected into (001) layers by the bridging 2,5-dimethylpyrazine ligands. Powder X-ray diffraction (PXRD) shows that a pure crystalline phase has been obtained. Thermogravimetry coupled to differential thermoanalysis (TG-TDA) reveal that the 2,5-dimethylpyrazine ligands are removed in two separate steps leading to the formation of a compound with the composition (CdBr₂)₂(2,5-dimethylpyrazine) that decomposes into CdBr₂ upon further heating. PXRD measurements of the residue obtained after the first mass loss show that a new crystalline phase has been formed.

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来源期刊

Acta Crystallographica Section E: Crystallographic Communications Chemistry-Chemistry (all)

CiteScore

1.90

自引率

0.00%

发文量

351

审稿时长

3 weeks

期刊介绍： Acta Crystallographica Section E: Crystallographic Communications is the IUCr''s open-access structural communications journal. It provides a fast, simple and easily accessible publication mechanism for crystal structure determinations of inorganic, metal-organic and organic compounds. The electronic submission, validation, refereeing and publication facilities of the journal ensure rapid and high-quality publication of fully validated structures. The primary article category is Research Communications; these are peer-reviewed articles describing one or more structure determinations with appropriate discussion of the science.