Conformational Analysis of Nonionic Surfactants in Water by a Selective Monodeuteration Method. C−D Stretching Infrared Spectroscopy of α-Monodeuterododecyl-ω-hydroxytris(oxyethylene)s
α-dodecyl-ω-hydroxytris(oxyethylene) (C12E3) in water has been studied by C−Dstretching infrared spectroscopy. This conformational analysis is based on the fact that the wavenumbers of the isolated C−Dstretching vibrations are sensitive to the conformation in the vicinity of the C−D bond. Infrared spectra were measured for five selectively monodeuterated species of C12E3, namely CH3(CH2)11-kCHD(CH2)k-1(OCH2CH2)3OH
水中的α-十二烷基-ω-羟基三(氧乙烯)(C 12 E 3)中的烷基链构象已通过C-D拉伸红外光谱法进行了研究。此构象分析基于以下事实:隔离的CD拉伸振动的波数对C-D键附近的构象敏感。测量了C 12 E 3的五个选择性单氘化物种的红外光谱,即CH 3(CH 2)11- k CHD(CH 2)k -1(OCH 2 CH 2)3 OH,其中k在层状(Lα)和各向同性溶液(L 2)相中分别等于1、2、4、6和8 。每个单氘代物质的C-D拉伸带被分配给链上特定氘代部分的特定构象。从观察到的C-D拉伸带的强度,评估十二烷基CC键和氧乙烯基连接的OC键周围的反式构象的分数以及两个相邻键周围的连续反式构象的分数。从L 2到Lα的相变时的构象变化并不重要,并且对于接近烷基/氧乙烯界面的CC键,反式分数仅观察到很小的增加。这意味着在它们的边界附近的L 2和Lα相中的构象状态基本上没有差异。在Lα相,当组成
Stereochemistry of the Primary Carbon. I. Optically Active n-Butanol-1-d<sup>1</sup>
作者:Andrew Streitwieser
DOI:10.1021/ja01116a038
日期:1953.10
Stereochemistry of lysine 2,3-aminomutase isolated from Clostridium subterminale strain SB4
作者:D. John Aberhart、Steven J. Gould、Horng Jau Lin、T. K. Thiruvengadam、Bruce H. Weiller
DOI:10.1021/ja00354a046
日期:1983.8
Stereochemistry of the Primary Carbon. IV. The Decomposition of Optically Active 1-Butyl-1-d Chlorosulfite<sup>1,2</sup>
作者:Andrew Streitwieser、William D. Schaeffer
DOI:10.1021/ja01559a038
日期:1957.1
Group Additivity for the Band Strength of the CF-Chromophore for IR-Photochemistry
作者:M. Quack、H. J. Thöne
DOI:10.1002/bbpc.19830870709
日期:1983.7
AbstractIntegrated band strengths for rovibrational absorption in the frequency range of the CF‐chromophore (800 to 1300 cm−1) have been obtained from vapour phase IR‐spectra of twelve fluoroalkanes containing one or more CF groups. It is found that the chromophore band strength is about 1.7 (pm)2 for each CF group with some minor variations due to neighbouring substituents at the CF carbon atom. These variations can be accounted for by a simple, empirical equation. The results are discussed in relation to the chromophore principle in IR‐photochemistry. The frequency distribution of the chromophore absorption for primary, secondary, and tertiary alkyl fluorides is considered. The primary CF‐chromophore (R ‐ CH2 ‐ F) is suggested to be a particularly useful general chromophore for CO2‐laser pumping. The foundations of the group additivity for chromophore band strengths and some further applications are discussed as well.