Local Excess Density about Substituted Benzene Compounds in Supercritical CO2 Based on FT-IR Spectroscopy
Local Excess Density about Substituted Benzene Compounds in Supercritical CO2 Based on FT-IR Spectroscopy
复制标题
基于 FT-IR 光谱的超临界 CO2 中取代苯化合物的局部过量密度
DOI：
10.1021/jp972309j
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发表时间：
1997
影响因子：
3.3
通讯作者：
S. Saito
中科院分区：
文献类型：
--
作者：
N. Wada;M. Saito;D. Kitada;R. L. Smith;H. Inomata;K. Arai;S. Saito
用原位红外光谱仪测定了取代苯类化合物在超临界CO_2中的红外光谱。开发了一个实验程序，提供了可靠的数据，并允许定量分析。取代基形变伸缩和C-C环伸缩的摩尔吸光系数随体系密度的变化而变化，但它们的密度依赖性不同。提出了一种测定苯衍生物在超临界CO2中局部过剩密度的方法。获得的局部过剩密度的表达式可以表示为一个单一的功能，在体积密度，并表现出最大值低于临界密度。
IR spectra of substituted benzene compounds were measured in supercritical CO2 with an apparatus capable of in situ measurement. An experimental procedure was developed which provided reliable data and allowed quantitative analyses. The molar absorption coefficient of substituent deformation stretch and C−C ring stretch were found to vary with the system density but their density dependence was different. A method for determining the local excess density of benzene derivatives in supercritical CO2 is proposed. The expression obtained for the local excess density can be represented by a single function in terms of bulk density and exhibits a maximum just below the critical density.