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

Christian Näther
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Abstract

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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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
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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来源期刊
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.
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