Coordination Polymer of M(II)-Pyrazinamide (M = Co, Cd) with Double End-to-End Thiocyanate Bridge

机译：M（II）-吡嗪酰胺（M = CO，CD）配位聚合物，双端硫氰酸酯桥

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Pyrazinamide (pza, C4N2H3-CONH2) is a good ligand for coordination polymer. Their transition metal complexes are known to have antibacterial activities, magnetic properties, etc. Coordination polymers of M(II)-pyrazinamide with thiocyanate (M = Co (a), Cd (b)), prepared using bench-top layering technique with M(II):pza:SCN ratio of 1:2:2, is successfully crystallised at room temperature. Single crystal XRD was used to determine the crystal structure. Infrared and melting point determination were also performed. Crystal structure of both complexes, solved in Triclinic P-1, show that each octahedral metal centre is connected to two adjacent metal centres by double end-to-end thiocyanate bridge forming a 1D polymeric structure with M···M distances of 5.524 A (in a) and 5.887 A (in b). Two monodentate pyrazinamide ligands occupy the rest of the coordination sites on the metal centre in a trans relationship. Only in complex a, one lattice pyrazinamide molecule is involved in the asymmetric unit. Crystal packing of both a and b are also displaying non-covalent networks as a result of hydrogen-bonding involving the pyrazine ring, amide and carbonyl groups between adjacent chains and π···π interactions (only occurred in a). In addition, the observed melting points of both a and b are relatively close to each other (around 180°C), and ATR-IR spectra support the presence of the bridging thiocyanate and terminal pyrazinamide.

机译：吡嗪酰胺（PZA，C4N2H3-CONH 2）为配位聚合物良好的配体。他们的过渡金属配合物是已知的具有抗菌活性的，磁特性等M的配位聚合物（II）-pyrazinamide硫氰酸（M = CO（A），镉（B）），使用台式分层技术具有M制备（II）：PZA：1 SCN比：2：2，在室温下成功地结晶。单晶XRD被用来确定晶体结构。还进行了红外线和熔点测定。两个复合物的晶体结构，在三斜晶系P-1，解决了表明每一个八面体金属中心由连接到两个相邻的金属中心的双端至端硫氰酸盐桥形成具有5.524甲的M个... m以内的距离一维聚合物结构（在a）和5.887 A（b）中。两个单齿吡嗪酰胺配体占据的反式关系的金属中心的协调网站的其余部分。仅在一个复杂的，一个晶格吡嗪酰胺分子参与在不对称单位。 a和b的晶体堆积也显示非共价网络为涉及相邻链和π...π相互作用之间的吡嗪环，酰胺和羰基氢键的结果（仅发生在一个）。此外，a和b的所观察到的熔点为相对彼此接近（约180℃），和ATR-IR光谱支持桥接硫氰酸盐和终端吡嗪酰胺的存在。

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《International Conference on Chemistry and Material Science》|2018年|668 p.|共8页
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Yuniar Ponco Prananto;
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Coordination Polymer of M(II)-Pyrazinamide (M = Co, Cd) with Double End-to-End Thiocyanate Bridge

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