Acetonitrile Adsorption on Polycrystalline Platinum: An In Situ Investigation Using Sum Frequency Spectroscopy
Acetonitrile Adsorption on Polycrystalline Platinum: An In Situ Investigation Using Sum Frequency Spectroscopy
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多晶铂上的乙腈吸附：使用和频光谱进行原位研究
DOI：
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发表时间：
2008
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影响因子：
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通讯作者：
C. Williams
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文献类型：
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作者：
S. B. Waldrup;C. Williams
和频光谱（SFS）已被用来探测Pt膜和纯乙腈或乙腈/溶剂混合物组成的液体之间的界面。在纯乙腈的情况下，观察到与吸附乙腈的C-CN（2239 cm-1）和C-H伸缩（2939 cm-1）相关的振动特征。Pt上的峰从本体值相比，Al 2 O3更显着下移，表明不同的表面上的吸附配置。随着溶液中乙腈浓度的变化，观察到主要νC N伸缩（2239 - 2229 cm-1）的显著下移，醇（EtOH和MeOH）比水引起更大的影响。此外，还观察到一个次级的、下移的νC N带（2229 - 2211 cm-1），其强度不随液相浓度变化，表明有更强的结合物种。对于乙腈在乙醇、甲醇和水中的CH 3伸缩模式，观察到类似的位移。这些频率的变化在这两个C N和C−H应力…
Sum frequency spectroscopy (SFS) has been used to probe the interface between Pt films and liquid consisting of neat acetonitrile or acetonitrile/solvent mixtures. In the case of the neat acetonitrile, vibrational features associated with C⋮N (2239 cm-1) and C−H stretching (2939 cm-1) from adsorbed acetonitrile were observed. The peaks on Pt were more significantly downshifted from bulk values compared to Al2O3, indicating different adsorption configurations on the surfaces. Significant downshifting of the primary νC⋮N stretch (2239−2229 cm-1) was observed with changing acetonitrile concentration in solution, with alcohols (EtOH and MeOH) causing larger effects than water. In addition, a secondary, downshifted νC⋮N band (2229−2211 cm-1) is observed whose intensity is invariant with liquid-phase concentration, indicating a more strongly bound species. Similar shifts were observed for the CH3 stretching mode of acetonitrile in ethanol, methanol, and water. These frequency shifts in both the C⋮N and C−H stre...