SiO_2/草酸络合物的水相合成及其光谱学证据

Water Phase Synthesis of SiO_2/ Oxalate Complex and Its Spectral Evidences

水岩相互作用中的重要问题之一是搞清硅在地层水中的赋存状态。采用正硅酸乙酯与草酸和硅酸钠与草酸在水溶液中反应 ,均得到相似的白色粉末状化合物。不同制备方法所得产物的红外光谱图无论在特征吸收峰还是指纹区都有重合 ,表明 2种产物基本为同一物质。产物与反应物相比 ,特征吸收峰有明显差异 ,暗示反应过程中有Si—O—C键或SiO2 /草酸络合物的生成。实验结果支持了具有双五元环结构SiO2 /草酸络合物的存在 。

An important issue in water-rock interactions is to know the existing state of silicon in formation water. Two methods are adopted to synthesis SiO_2/oxalate complex in water. The reactions of sodium silicate with oxalic acid and with tetraethylsilicate can both obtain white powder compounds. The IR pedigrees of two products are overlapped on the whole, both typical absorbent peaks and fingerprint segments are different from those of reactors, which indicates that two powders produced with two different methods are the same substance basically. The experimental results indicate that there exists Si—O—C new bonds and SiO_2/oxalate complex produced in reactions and the new compound is of bi-five-member cycle configuration. It holds out the hypothesis directly that bi-carboxylic acids can speed up the corroded and migration rate of quarts and aluminosilicete rock in formation water.