So Hyunsoo, Jung Hyun, Choy Jin-Ho, Belford R Linn
Department of Chemistry, Sogang University, Seoul 121-742, Korea.
J Phys Chem B. 2005 Mar 3;109(8):3324-9. doi: 10.1021/jp0454826.
Electron paramagnetic resonance (EPR) spectra of powder and oriented films of montmorillonite, hectorite, and saponite intercalated with Cu(cyclam) (cyclam = 1,4,8,11-tetraazacyclotetradecane) exhibit three components: an orientation-dependent component without hyperfine features, an orientation-dependent component with hyperfine features, and an orientation-independent component without hyperfine feature. EPR spectra of Cu(cyclam)-saponite, which exhibit only two components and the best resolved hyperfine features, were simulated. The spectra indicate that a large portion of the saponite platelets are inclined to the glass surface, although they tend to align with their basal planes parallel to the glass surface. The orientation-dependent spectra could be simulated by introducing a Gaussian distribution with a standard deviation of 20 degrees for the inclination angle. The standard deviation may be used as a disorder parameter for the microcrystals assembled on glass plates. Spectral simulation also shows that the CuN(4) plane of Cu(cyclam) is parallel to the clay layers. EPR spectra of some other partially oriented systems are also discussed.
蒙脱石、锂皂石和皂石插层Cu(环胺)（环胺 = 1,4,8,11-四氮杂环十四烷）的粉末及取向薄膜的电子顺磁共振（EPR）谱显示出三个组分：一个无超精细特征的取向相关组分、一个有超精细特征的取向相关组分以及一个无超精细特征的取向无关组分。对仅显示两个组分且具有最佳分辨超精细特征的Cu(环胺)-皂石的EPR谱进行了模拟。谱图表明，尽管皂石薄片倾向于使其基面与玻璃表面平行排列，但其中很大一部分薄片相对于玻璃表面是倾斜的。通过引入倾斜角标准偏差为20度的高斯分布，可以模拟取向相关谱。该标准偏差可作为组装在玻璃板上的微晶的无序参数。谱图模拟还表明，Cu(环胺)的CuN(4)平面与粘土层平行。还讨论了其他一些部分取向体系的EPR谱。
