CAJ | 학술논문

测量了非极性分子β胡萝卜素和极性分子角黄素,在非极性溶剂CS2和极性溶剂1,2二氯乙烷中243—293 K的温度范围内的共振拉曼光谱.结果表明,溶质和溶剂的极性对拉曼光谱影响很大.非极性分子β胡萝卜素在非极性溶剂CS2中的拉曼散射截面最大,线宽最窄,而极性分子角黄素在极性溶剂1,2二氯乙烷中的拉曼散射截面最小,线宽最大.用溶剂效应及线性多烯分子的“相干弱阻尼电子-晶格振动”,“有效共轭长度”模型给予了解释.
측량료비겁성분자β호라복소화겁성분자각황소,재비겁성용제CS2화겁성용제1,2이록을완중243—293 K적온도범위내적공진랍만광보.결과표명,용질화용제적겁성대랍만광보영향흔대.비겁성분자β호라복소재비겁성용제CS2중적랍만산사절면최대,선관최착,이겁성분자각황소재겁성용제1,2이록을완중적랍만산사절면최소,선관최대.용용제효응급선성다희분자적“상간약조니전자-정격진동”,“유효공액장도”모형급여료해석.
The resonance Raman spectra of nonpolar molecule all-trans-β-carotene and polar molecule canthaxanthin in nonpolar CS2 and polar 1,2-dicholoroethane in a temperature range from 243K to 293K are measured. The results show that polarities of the solute and solvent have a great effect on Raman spectrum. Raman scattering cross-section of nonpolar all-trans-β-carotene in nonpolar solvent CS2 is biggest and its bandwidth is narrowest. Raman scattering cross-section of polar canthaxanthin in polar solvent 1,2-dicholoroethane is smallest and its bandwidth is widest. The experimental phenomena are explained by solvent effects, coherent weakly damped electron-lattice vibration and effective conjugated length.