Abstract In current work the features of 1,3,5-trinitrobenzene (TNB) transformation into paramagnetic products on the surface of aluminum/magnesium oxides calcined at 550°C, as well as MgAl double oxides, were investigated by EPR spectroscopy. It was shown that the increase of basicity (i.e. MgO content) leads to the increase in the concentration of formed radical anions, wherein the presence of acidic sites contributes to their stabilization on the surface. The effect of n-hexane and toluene used as solvents in the transformation of adsorbed TNB radical anions was established, and a new probe EPR technique for using TNB to determine the concentration of the basic sites in MgAl double oxides was proposed. The results of the proposed technique are in good agreement with the data on the basic sites concentration obtained from the adsorption capacity CO2 of the corresponding samples.

中文翻译：

---

1,3,5-三硝基苯作为自旋探针在镁铝双氧化物表面基本位点研究中的应用EPR光谱

摘要 在目前的工作中，通过EPR 光谱研究了1,3,5-三硝基苯(TNB) 在550°C 煅烧的铝/镁氧化物以及MgAl 双氧化物表面上转化为顺磁性产物的特征。结果表明，碱度（即MgO含量）的增加导致形成的自由基阴离子浓度的增加，其中酸性位点的存在有助于它们在表面上的稳定化。建立了正己烷和甲苯作为溶剂对吸附的TNB自由基阴离子转化的影响，并提出了一种利用TNB测定MgAl双氧化物中碱性位点浓度的新型探针EPR技术。