Investigation of the molecular motion of self-assembled fatty acid films

被引：25

作者：

Risse, T ^{[1
]}

Hill, T ^{[1
]}

Schmidt, J ^{[1
]}

Abend, G ^{[1
]}

Hamann, H ^{[1
]}

Freund, HJ ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1998年 / 102卷 / 15期

关键词：

D O I：

10.1021/jp972459u

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：

We have investigated self-assembled stearic acid films adsorbed on an Al2O3 film by means of electron paramagnetic resonance (EPR) as well as near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The stearic acid molecules are orientated in the film as shown by the NEXAFS data. Doping of the film with spin-labels in order to make the films accessible to EPR spectroscopy distorts the structure only slightly as long as the concentration of the spin-labels is low. The temperature-dependent EPR spectra reveal a distinct dependence of the onset of the rotational motion of the spin-label with variation of the location of the spin-label along the chain. The analysis of the EPR line shape allows to gain insight into the internal motion of the molecular chain.

引用

页码：2668 / 2676

页数：9

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