Inelastic electron tunnelling spectroscopy (IETS) of carboxylic acids and related systems chemisorbed on plasma-grown aluminium oxide. Part 2.—Propynoic acid, propenoic acid and 3-methyl-but-2-enoic acid
Inelastic electron tunnelling spectroscopy (IETS) of carboxylic acids and related systems chemisorbed on plasma-grown aluminium oxide. Part 2.—Propynoic acid, propenoic acid and 3-methyl-but-2-enoic acid
复制标题
等离子体生长的氧化铝上化学吸附的羧酸和相关系统的非弹性电子隧道光谱 (IETS) 第 2 部分：丙炔酸、丙烯酸和 3-甲基-丁-2-烯酸。
DOI：
10.1039/f29797500032
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
D. G. Walmsley
中科院分区：
文献类型：
--
作者：
N. Brown;W. J. Nelson;D. G. Walmsley
对丙酸、丙烯酸和3-甲基-2-烯酸的非弹性电子隧穿谱(IETS)的研究表明，它们以表面结合的羧酸盐物种的形式从蒸汽中化学吸附到等离子体生长的氧化铝上。在丙烯酸的情况下，有明显的证据表明在一些吸附位置上发生了三键反应。类似的考虑也适用于丙烯酸，但不适用于空间密度更大的3-甲基-2-烯酸。这些被吸附的羧酸盐物种的表面反应可能涉及π-电子体系的Bronsted酸质子化。观察到的谱带强度表明吸附在接近垂直的表面上。
A study of the inelastic electron tunnelling spectra (IETS) of propynoic acid, propenoic acid and 3-methyl-but-2-enoic acid shows that these are chemisorbed from the vapour on to plasma-grown aluminium oxide as surface-bound carboxylate species. In the case of propynoic acid there is clear evidence for reaction of the triple bond at some of the adsorption sites. Similar considerations apply to the propenoic acid but not to the sterically more crowded 3-methyl-but-2-enoic acid. It is suggested that these surface reactions of the adsorbed carboxylate species may involve a Bronsted acid protonation of the π-electron systems present. Observed band intensities are held to be indicative of an adsorbate orientation to the surface which is close to the vertical.