Coward John L
School of Physics and Astronomy, Cardiff University, 5, The Parade, Cardiff, CF24 3AA UK.
J Biol Phys. 2010 Sep;36(4):405-25. doi: 10.1007/s10867-010-9192-6. Epub 2010 Aug 5.
As there are no published graphically presented, detailed IR spectra of nonacosan-10-ol (occurring naturally and widely in plant epicuticular waxes of nanotube form), near IR FTIR spectroscopy (fundamentals, overtones and combinations) has been performed on laboratory synthesized racemic nonacosan-10-ol, as a crystalline solid on Mylar and polypropylene substrates. Room temperature, in vacuo data are presented graphically, in full, and show evidence of extensive hydrogen bonding, an orthorhombic perpendicular subcell, a methylene wagging progression, diagnostic of all-trans conformational order, and Fermi resonance. Moderate or stronger anharmonicity is confirmed. Detailed discussion, quantitative in parts, is given of the observed spectral features, especially as to how they inform crystal structure and molecular conformation, and assignments given for some of the features. The results will serve as a reference for future IR studies of the natural epicuticular wax nanotube form of (S)-nonacosan-10-ol.
由于没有已发表的关于二十九烷-10-醇（天然广泛存在于纳米管形式的植物表皮蜡中）的详细红外光谱图，因此对实验室合成的外消旋二十九烷-10-醇进行了近红外傅里叶变换红外光谱分析（基频、泛频和组合频），该样品以结晶固体形式存在于聚酯薄膜和聚丙烯基底上。给出了室温下真空条件下的数据全图，显示出广泛氢键、正交垂直亚晶胞、亚甲基摇摆进程（这是全反式构象有序的诊断依据）以及费米共振的证据。证实了存在中等或更强的非谐性。对观察到的光谱特征进行了详细讨论，部分内容为定量分析，尤其阐述了这些特征如何反映晶体结构和分子构象，并对一些特征进行了归属。这些结果将为未来对（S）-二十九烷-10-醇天然表皮蜡纳米管形式的红外研究提供参考。
