聚[二μ-溴-μ-2,3-二甲基吡嗪-κ2 N 1:N 4-镉]的合成、晶体结构和热行为

IF 0.5 Q4 CRYSTALLOGRAPHY

Acta Crystallographica Section E: Crystallographic Communications Pub Date : 2026-08-01 Epub Date: 2026-08-12 DOI:10.1107/S205698902600736X

Christian Näther

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引用次数: 0

摘要

用溴化镉与2,3-二甲基吡嗪在乙腈中反应制备了标题化合物[CdBr2(C6H8N2)] n。粉末x射线衍射（PXRD）表明得到了纯相。不对称单元由一个位于反转中心的Cd阳离子、一个位于双旋转轴上的2,3-二甲基吡嗪配体和一个位于一般位置的溴离子组成。在扩展结构中，镉阳离子由四个桥接的溴阴离子和两个桥接的2,3-二甲基吡嗪配体八面体配位。阳离子通过普通溴离子边连接成[010]链，该链通过桥接2,3-二甲基吡嗪共配体进一步连接成（100）层。利用热重法和差热分析的测量结果表明，该化合物分解分为两个独立的步骤，其中形成了一个更缺乏2,3-二甲基吡嗪的化合物，根据PXRD测量，该化合物为结晶。

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Syntheses, crystal structure and thermal behavior of poly[di-μ-bromido-μ-2,3-dimethylpyrazine-κ2N1:N4-cadmium(II)]

The title compound, [CdBr₂(C₆H₈N₂)]_n, was prepared by the reaction of cadmium bromide with 2,3-dimethylpyrazine in acetonitrile. Powder X-ray diffraction (PXRD) indicated that a pure phase had been obtained. The asymmetric unit consists of one Cd cation located on a center of inversion, one 2,3-dimethylpyrazine ligand situated on a twofold rotation axis and one bromide anion in a general position. In the extended structure, the cadmium cation is octahedrally coordinated by four bridging bromide anions and two bridging 2,3-dimethylpyrazine coligands. The cations are linked via common bromide-ion edges into [010] chains that are further connected into (100) layers by the bridging 2,3-dimethylpyrazine coligands. Measurements using thermogravimetry and differential thermoanalysis reveal that the compound decomposes in two separate steps in which a more 2,3-dimethylpyrazine-deficient compound is formed, which according to PXRD measurements is crystalline.

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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.