Two-Dimensional Correlation Spectroscopy (2D-COS) Studies of Solution Mixtures in the Low Frequency Raman Region

Two-Dimensional Correlation Spectroscopy (2D-COS) Studies of Solution Mixtures in the Low Frequency Raman Region
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低频拉曼区域溶液混合物的二维相关光谱 (2D-COS) 研究

DOI:
10.1177/0003702819848501
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发表时间:
2019
影响因子:
3.5
通讯作者:
Noda, Isao
Noda, Isao
中科院分区:
化学3区
文献类型:
--
作者:
Xu, Shuyu;Bruce Chase, D.;Rabolt, John F.;Noda, Isao

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使用二维相关光谱 (2D-COS) 技术在低频区域分析了一系列二元溶液混合物的拉曼光谱,包括氯仿 (CHCl3)、乙醇 (EtOH) 和 1,1,1,3,3,3-六氟-2-丙醇 (HFIP)。这些有机溶剂混合物的浓度依赖性拉曼光谱中普遍出现了许多异步交叉峰。结果清楚地表明与理想溶液行为的偏差,反映了特定分子相互作用的存在,导致拉曼谱带对浓度变化产生微妙的非线性光谱强度响应。此外,2D-COS 和低频拉曼光谱的组合扩展到 CHCl3-HFIP 共溶剂中的聚[(R)-3-羟基丁酸酯-共-(R)-3-羟基己酸酯](PHBHx) 共聚物溶液。结果表明PHBHx和HFIP之间存在氢键相互作用,这与之前对PHBHx溶液的红外光谱研究一致。
Raman spectra of a series of binary solution mixtures, including chloroform (CHCl3), ethanol (EtOH), and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), were analyzed using the two-dimensional correlation spectroscopic (2D-COS) technique in the low frequency region. Numerous asynchronous cross-peaks ubiquitously appeared in the concentration-dependent Raman spectra of these organic solvent mixtures. The result clearly demonstrated a deviation from ideal solution behavior, reflecting the presence of specific molecular interactions causing a subtle nonlinear spectral intensity response of Raman bands to the concentration changes. Furthermore, the combination of 2D-COS and low frequency Raman spectroscopy was extended to poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] (PHBHx) copolymer solutions in CHCl3-HFIP co-solvents. The results suggest the existence of hydrogen bonding interaction between the PHBHx and HFIP, which is consistent with the previous infrared spectroscopic study of PHBHx solutions.
DOI: --
发表时间: 2017
影响因子: 2.9
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