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首页> 外文期刊>Chemistry: A European journal >Unprecedented alkylzinc-magnesium alkoxide clusters as suitable organometallic precursors for magnesium-containing ZnO nanoparticles
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Unprecedented alkylzinc-magnesium alkoxide clusters as suitable organometallic precursors for magnesium-containing ZnO nanoparticles

机译：前所未有的烷基锌-镁醇盐簇作为含镁ZnO纳米颗粒的合适有机金属前体

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摘要

The synthesis and characterization of the first heterobimetallic methylzinc-magnesium alkoxide clusters [Me_6MgZn_6(OR) _8] [R=Et (1 a), n-Pr (1 b), nBu (1 c)] with a bis-cubane-shaped MgZn_6O_8 core is described. The thermal degradation of 1 a-c and mixtures of 1 a and the homometallic MeZn-alkoxide cubane [{MeZnOtBu}_4] (2) in dry synthetic air led to wide-band-gap semiconducting Mg_xZn_(1-x)O nanoparticles at temperatures below 500 °C. The final materials were characterized by different analytical techniques such as PXRD, REM, TEM, EDX, and IR spectroscopy. The morphology of the as-prepared magnesium-containing ZnO samples is influenced by the different organo groups (alkoxo) in the precursors. EDX mapping showed that magnesium is uniformly distributed in the ZnO matrix. The incorporation of magnesium led to a distortion of the ZnO lattice with increased a axis and decreased c axis parameters. Room-temperature photoluminescence (PL) spectra reveal that the near-band-edge (NBE) emission of Mg~(2+)-doped ZnO is shifted to higher energies relative to that of pure ZnO.
机译：合成的第一双双金属甲基锌镁醇盐簇[Me_6MgZn_6（OR）_8] [R = Et（1 a），n-Pr（1 b），nBu（1 c）]描述了MgZn_6O_8核。在干燥的合成空气中1 ac及其混合物1a和均金属的MeZn-烷氧化物古巴[{MeZnOtBu} _4]（2）的热降解导致宽带隙半导体Mg_xZn_（1-x）O纳米粒子的温度低于500℃。通过不同的分析技术（例如PXRD，REM，TEM，EDX和IR光谱）对最终材料进行了表征。制备的含镁ZnO样品的形态受到前体中不同有机基团（烷氧基）的影响。 EDX图谱表明镁在ZnO基体中均匀分布。镁的掺入导致ZnO晶格的畸变，其具有增加的轴和降低的c轴参数。室温光致发光（PL）光谱显示，掺杂Mg〜（2+）的ZnO的近带边（NBE）发射相对于纯ZnO的发射向更高的能量转移。

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