Infrared photodissociation spectroscopy and density-functional calculations of protonated methanol cluster ions: Solvation structures of an excess proton.

Infrared photodissociation spectroscopy and density-functional calculations of protonated methanol cluster ions: Solvation structures of an excess proton.
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质子化甲醇簇离子的红外光解离光谱和密度泛函计算:过量质子的溶剂化结构。

DOI:
10.1063/1.2963499
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发表时间:
2008
期刊:
The Journal of chemical physics
影响因子:
--
通讯作者:
K. Tsukiyama
K. Tsukiyama
中科院分区:
--
文献类型:
--
作者:
K. Tono;J. Kuo;M. Tada;Koudai Fukazawa;N. Fukushima;C. Kasai;K. Tsukiyama

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用密度泛函理论和中红外光解离光谱研究了质子化甲醇团簇离子H(+)(CH(3)OH)(n)(n=5-8)中过量质子的溶剂化结构.这项工作表明,过量的质子是离域的两个甲醇分子之间。在1400-1800 cm(-1)范围内观察到的光谱特征归因于涉及共享质子和两个配体分子的集体运动的振动模式。在n=6-8时,在1800 cm(-1)以上区域的宽光谱特征表明存在异构体,其中过量质子和甲醇分子紧密结合形成离子核CH(3)OH(2)(+)。
Solvation structures of an excess proton in protonated methanol cluster ions, H(+)(CH(3)OH)(n) (n=5-8), were investigated by photodissociation spectroscopy in the middle infrared region (900-2300 cm(-1)) and by using density-functional theory. This work indicates that the excess proton is delocalized between two methanol molecules. Spectral features observed in the range 1400-1800 cm(-1) are attributed to vibrational modes involving collective motion of the shared proton and the two ligand molecules. At n=6-8, broad spectral features in the region above 1800 cm(-1) suggest coexistence of isomers in which the excess proton and a methanol molecule are tightly bound to form an ion core, CH(3)OH(2) (+).
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