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Cold-spray ionization mass spectrometry of the choline chloride-urea deep eutectic solvent (reline)

机译:胆碱氯化胆碱 - 尿素深凝胶溶剂的冷喷雾电离质谱(Reline)

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摘要

Cold-Spray Ionization mass spectrometry (CSI-MS) that can be compared to an electrospray ionization (ESI) source acting with a nebulizing gas cooled by liquid nitrogen is used for analyzing reline as Deep Eutectic Solvent (DES). The association of cholinium chloride salts with urea molecules is evidenced in negative CSI-MS through the chloride adduct formation. The structure of the supramolecular assemblies forming the reline ions that are observed on CSI mass spectra is rationalized by chemical quantum calculations. The theoretical studies indicate that the ionic network organization is only supported by a maximization of hydrogen bonds of the chlorides with the hydroxyl and methyl moieties of the cholinium cations and the amino groups of urea. The studies of gas-phase fragmentation of the supra-molecular ionic assemblies detected in CSI-MS are performed using the in-source collision-induced dissociation experiments. The experimental measurements in CSI-MS, interpreted at the light of the molecular modelization results, suggest that the insertion of urea in adducts of chlorides with cholinium cations does not lead to the most stable ions.
机译:冷喷雾电离质谱(CSI-MS)可与电喷雾电离(ESI)源与液氮冷却的雾化气体进行比较,用于分析作为深共晶溶剂(DES)的瑞林。氯化胆碱盐与尿素分子的结合通过氯加合物的形成在负CSI-MS中得到证实。通过化学量子计算,对CSI质谱上观察到的形成瑞林离子的超分子组装体的结构进行了合理化。理论研究表明,离子网络组织仅由氯化物与胆碱阳离子的羟基和甲基部分以及尿素的氨基的氢键的最大化来支持。利用源内碰撞诱导离解实验对CSI-MS中检测到的超分子离子组装体的气相碎裂进行了研究。根据分子模型化结果解释的CSI-MS中的实验测量表明,在氯化物与胆碱阳离子的加合物中插入尿素不会产生最稳定的离子。

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