Elucidating the Reaction Mechanisms between Triazine and Hydrogen Sulfide with pH Variation Using Mass Spectrometry
作者:Xiaoting Wang、Yajun Zheng、Jun Shi、Xiaoyun Gong、Yue Ji、Weiwei Han、You Jiang、Daniel E. Austin、Xiang Fang、Zhiping Zhang
DOI:10.1021/acs.analchem.8b03107
日期:2018.9.18
solvent (e.g., methanol), because of hydrogen bond interaction. Varying the pH of the reaction leads to completely different reaction pathways. With the pH in the range of 5.58 to 7.73, the major product was thiadiazine. With a pH of 3.02–3.69, thiadiazine is converted to 2-(5-(2-hydroxyethyl)-1,3,5-thiadiazinan-3-yl)acetaldehyde, which differs from the traditional pathway of analogous reactions. However
三嗪是最经济有效的清除硫化氢(H 2 S)的清除剂之一,但三嗪与H 2之间的反应机理溶液中pH随变化而变化的S仍知之甚少。在此,我们表明反应过程可以通过纸喷雾质谱直接检测,其中质子惰性溶剂(例如乙腈)比质子溶剂(例如甲醇)更有利于观察反应中间体,因为氢键相互作用。反应pH值的变化会导致完全不同的反应途径。pH值在5.58至7.73之间,主要产物是噻二嗪。在3.02–3.69的pH值下,噻二嗪可转化为2-(5-(2-羟乙基)-1,3,5-噻二嗪基-3-基)乙醛,这与传统的类似反应途径不同。但是,由于将氨加入反应中并将pH值调整为8.45-9.43,三嗪很容易发生水解,3,7 ]癸烷(HTAD)。将pH值进一步提高至10.27-11.21会导致HTAD分解。基于实验观察和高分辨率和串联质谱的证据,我们提出了三嗪与H 2 S之间的合理反应机理,以及三嗪在不同pH条件下的衍生反应。