RAMAN-SPECTRA OF LIQUID N-ALKANES .2. LONGITUDINAL ACOUSTIC MODES AND THE GAUCHE-TRANS ENERGY DIFFERENCE

被引：77

作者：

SCHERER, JR ^{[1
]}

SNYDER, RG ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720

来源：

JOURNAL OF CHEMICAL PHYSICS | 1980年 / 72卷 / 11期

关键词：

D O I：

10.1063/1.439102

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Low-frequency bands in the Raman spectra of the liquid n-alkanes, n=9-20, have been identified with extended and certain nearly extended rotameric forms of these molecules. The bands are associated with the intense longitudinal-acoustic-mode (LAM-1) band that appears in the Raman spectra of crystalline n-alkanes. For liquids, the intensities of these bands are highly temperature dependent. This dependence was measured for the n=11-14 n-alkanes and was used to determine an average value for ΔE, the energy difference between the trans and gauche states of the CC bond. The value determined for δE, 508±50 cal/mole, is very near the value commonly assumed in statistical calculations based on the rotational isomeric model. No evidence for local order was found even at temperatures just above the melting point of n-C13H28 and n-C14H30. © 1980 American Institute of Physics.

引用

页码：5798 / 5808

页数：11

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