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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >The role of hydrogen bonding in the selectivity of L-cysteine methyl ester (CYSM) and L-cysteine ethyl ester (CYSE) for chloride
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The role of hydrogen bonding in the selectivity of L-cysteine methyl ester (CYSM) and L-cysteine ethyl ester (CYSE) for chloride

机译：氢键在L-半胱氨酸甲酯（CYSM）和L-半胱氨酸乙酯（CYSE）对氯化物的选择性中的作用

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摘要

The interaction of cysteamine (CY), L-Cysteine methyl ester (CYSM), and L-cysteine ethyl ester (CYSE) with nitrate, sulfate, perchlorate, dihydrogen phosphate, and chloride ions was investigated using surface enhanced Raman spectroscopy (SERS). CYSM and CYSE are chemical derivatives of CY. These thiols have a quaternary ammonium group to attract the anions to the SERS surface. Dihydrogen phosphate did not interact with these cationic thiols. The CY interaction with perchlorate, nitrate, and sulfate is stronger than the interaction with chloride. However, replacing a hydrogen on the carbon adjacent to the quaternary ammonium group with either a methyl or ethyl ester group results in stronger complexation with chloride ion than with either sulfate or nitrate ion. In the case of CYSM, the chloride interaction is five times stronger than the interaction with perchlorate. Molecular modeling indicates that the high selectivity of CYSM/CYSE for chloride is due to hydrogen bonding between the chloride ion and the hydrogen of the CH3 moeities of adjacent ester groups. (C) 2004 Elsevier B.V. All rights reserved.
机译：使用表面增强拉曼光谱（SERS）研究了半胱胺（CY），L-半胱氨酸甲酯（CYSM）和L-半胱氨酸乙酯（CYSE）与硝酸根，硫酸根，高氯酸根，磷酸二氢根和氯离子的相互作用。 CYSM和CYSE是CY的化学衍生物。这些硫醇具有季铵基团，可将阴离子吸引到SERS表面。磷酸二氢不与这些阳离子硫醇相互作用。 CY与高氯酸盐，硝酸盐和硫酸盐的相互作用比与氯化物的相互作用强。然而，用甲基或乙基酯基团代替与季铵基团相邻的碳上的氢会导致与氯离子的络合作用比与硫酸根或硝酸根离子的络合作用更强。在CYSM的情况下，氯化物的相互作用比与高氯酸盐的相互作用强五倍。分子模型表明，CYSM / CYSE对氯的高选择性是由于氯离子与相邻酯基团CH3部分的氢之间的氢键所致。 （C）2004 Elsevier B.V.保留所有权利。

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