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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >A novel trinuclear zinc metal-organic network: Synthesis, X-ray diffraction structures, spectroscopic and biocompatibility studies
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A novel trinuclear zinc metal-organic network: Synthesis, X-ray diffraction structures, spectroscopic and biocompatibility studies

机译：新型三核锌金属有机网络：合成，X射线衍射结构，光谱和生物相容性研究

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摘要

Crystal structure and vibrational spectra of a new zinc metal-organic network, {[Zn_3(tp)_4]·4H_2O}_n, 1, have been studied. The compound was constructed from Zn(NO_3) _2·6H_2O and H_2tp ligand (H2tp = 1,4-benzen-edicarboxylic acid) by solvothermal synthesis in DMF. Its framework is built from the trinuclear SBUs as eight-connected nodes and tp ligands as spacers. Each node consists of three Zn~(II) ions that are in a linear arrangement with Zn···Zn distance of 3.271 ?. The distorted octahedral middle Zn atom is connected to six oxygen atoms (Zn-O = 2.036-2.252 ?) belonging to six different tp carboxylate group. Each of the two terminal Zn atoms is coordinated by four oxygen atoms (Zn-O = 1.952-1.986 ?) belonging to four carboxylate groups of tp ligands. Normal-coordinated analysis of the vibrational spectra together with force field calculations for Zn(O_2CC)_n (n = 4 or 6) entities which is the most affected by coordination effect have been performed. The results show consistency of the lower values of force constants for ZnO_6 entity compare to ZnO_4 that could be related to the stronger inter-ligand repulsion in octahedron compare to tetrahedron. In-situ PXRD patterns show two gradual structural transformations from ambient to 400 °C and a new ZnO phase is formed between 400 and 500 °C that are in a good agreement with thermal gravimetric analysis. Photoluminescence measurement in the solid state shows an emission at 420 nm which is in accordance with other zinc carboxylate MOFs. The potential cytotoxicity of 1 was evaluated on human amniotic epithelial cells (hAECs) by XTT assay. The results clearly showed that this compound exerted little in vitro cytotoxic effect in a wide range of concentration and time intervals.
机译：研究了一种新型锌金属有机网络{[Zn_3（tp）_4]·4H_2O} _n，1的晶体结构和振动光谱。该化合物是由Zn（NO_3）_2·6H_2O和H_2tp配体（H2tp = 1,4-苯-乙二羧酸）在DMF中溶剂热合成而成。它的框架由三核SBU作为八个连接的节点，而tp配体作为间隔基构建。每个节点由三个线性排列的Zn〜（II）离子组成，Zn···Zn距离为3.271？。扭曲的八面体中间Zn原子与属于六个不同tp羧酸酯基团的六个氧原子（Zn-O = 2.036-2.252？）连接。两个末端的Zn原子中的每一个都由四个tp配体的羧酸酯基的氧原子（Zn-O ＝1.952-1.986α）配位。进行了振动光谱的正坐标分析，以及受协调效应影响最大的Zn（O_2CC）_n（n = 4或6）实体的力场计算。结果表明，与ZnO_4相比，ZnO_6实体的力常数较低的值的一致性，这可能与八面体相比四面体的较强的配体间排斥力有关。原位PXRD图谱显示了从环境温度到400°C的两个逐渐的结构转变，并且在400和500°C之间形成了新的ZnO相，这与热重分析非常吻合。固态的光致发光测量显示出在420 nm处的发射，这与其他羧酸锌MOF一致。通过XTT分析评估1对人羊膜上皮细胞（hAEC）的潜在细胞毒性。结果清楚地表明，该化合物在宽范围的浓度和时间间隔内几乎没有发挥体外细胞毒性作用。

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