High-pressure ATR spectroscopic study on conformation and hydration of oxyethylene

氧乙烯构象和水合的高压ATR光谱研究

• 批准号: 13640513
• 负责人: FUKUHARA Koichi
• 金额: $ 2.37万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640513/
• 关键词: high-pressure infrared spectroscopy; oxyethylene; conformation; block compounds; ブロックオリゴマー

Molecular conformation of nonionic surfactants alkyl / oligo(oxyethylene) diblock compounds H(CH_2)_n(OCH_2CH_2)_mOH (C_nE_n) and their hydration behavior in the C_nE_m-water binary system have been studied by high-pressure infrared spectroscopy. Molecular conformation, molecular packing, and hydration of the surfactants in the gel phase have been studies using a diamond attenuated total reflection cell (DATRC) and a diamond anvil cell (DAC).We have first several sampling method for high-pressure DATRC measurement, because no standard method is available in this procedure. Consequently, we have obtained a pressure up to ca. 30 MPa with opposed anvils arrangement between a DATRC element and a pressure shoe. Accordingly, infrared measurements in pressure range from ambient pressure to ca. 5 GPa became possible with DATRC and DAC.We have studied pressure dependent molecular form and packing for the C_nE_7 compounds, because C_nE_7s assume the * form, which is the molecular form different from the * form for the other C_nE_ms with m=3-6 and m【greater than or equal】 8 in the solid state. As the peculiar form for C_nE_7s results from molecular packing in the crystal, external pressure should perturb the molecular form and packing.For C_<10>E_7-H_2O system, Hydrogen bonding was strengthened with increasing pressure and a conformational transformation from the * form to the * form has been observed at about 1 GPa. For C_<16>E_7-H_2O system, on the other hand, conformational transformation has not been occurred but small wavenumber sift for the infrared bands attributed to the oligo (oxyethylene) part been observed.

用高压红外光谱研究了烷基/低聚氧乙烯两嵌段化合物H(CH2)n(OCH2CH2)MoH(CNe N)的分子构象及其在CNe m-水二元体系中的水化行为。用金刚石衰减全反射池(DATRC)和金刚石顶压池(DAC)研究了表面活性剂在凝胶相中的分子构象、分子堆积和水化作用。由于在高压DATRC测量中没有标准方法，我们首先有了几种取样方法。因此，我们获得了压力高达约30兆帕，在DATRC元件和压靴之间具有相对的砧板布置。因此，利用DATRC和DAC可以在常压到约5 Gpa的压力范围内进行红外测量。我们研究了C_Ne_7化合物的压力依赖分子形式和堆积，因为C_Ne_7化合物采用*形式，这是不同于其他固体状态下m=3-6和m[大于或等于]8的C_Ne_m的*形式的分子形式。由于C_Ne_7S的特殊构型是由晶体中的分子堆积引起的，外加压力会对其构型和堆积产生扰动。对于C_&lt；10&gt；E_7-H_2O体系，氢键随着压力的增加而增强，并在1 Gpa左右观察到从*构象到*构象的转变。另一方面，对于C&lt；16&gt；E_7-H_2O体系，没有发生构象转变，但观察到低聚(氧)乙烯部分的红外吸收峰较小的波数。

项目成果

福原 幸一: "Melting of the All-trans Planar Modification of Triblock Oligomers α-n-alkyl-ω-n-alkoxyoligo(oxyethylene)s"Chemistry Letters. 2001(8). 828-829 (2001)

Koichi Fukuhara：“三嵌段低聚物 α-n-烷基-ω-n-烷氧基寡聚（氧乙烯）的全反式平面修饰的熔化”化学快报 2001（8）（2001）。

福原幸一: "Melting of the All-trans Planar Modification of Triblock Oligomers α-n-alkyl-ω-alkoxyoligo(oxyethylene)s"Chemistry Letters. 2001(8). 828-829 (2001)

Koichi Fukuhara：“三嵌段低聚物 α-n-烷基-ω-烷氧基寡聚（氧乙烯）的全反式平面修饰的熔化”，化学快报 828-829（2001）。

FUKUHARA, Koichi: "Melting of the All-trans Planar Modification of Triblock Oligomers a-n-alkyl-w-alkoxyoligo(oxyethylene)s"Chemistry Letters. (8). 828-829 (2001)

FUKUHARA, Koichi：“三嵌段低聚物 a-n-烷基-w-烷氧基低聚（氧乙烯）的全反式平面修饰的熔化”化学快报。

福原 幸一: "Melting of the All-trans Planar Modification of Triblock Oligomers α-n-alkyl-ω-alkoxyoligo(oxyethylene)s"Chemistry Letters. 2001(8). 828-829 (2001)

Koichi Fukuhara：“三嵌段低聚物 α-n-烷基-ω-烷氧基寡聚（氧乙烯）的全反式平面修饰的熔化”，化学快报 828-829（2001）。