温度对β胡萝卜素结构有序的影响

摘要

The effects of temperature on the visible absorption and Raman spectra of all-trans-β-carotene dissolved in dimethyl sulfoxide at temperatures ranging from 81 ◦C to 18 ◦C were determined. The bands of the visible absorption and Raman spectra of all-trans-β-carotene showed red blue shifts. The bandwidth of the Raman spectra becomes narrow. Raman scattering cross-section increases as the temperature decreases. The red shift of the absorption spectrum is attributed to the thermal conformational change-induced decrease in the effective conjugation length in all-trans-β-carotene chains. The molecular structural order increases and theπ-electron delocalization range is extended as the temperature decreases. The red shift in all-trans-β-carotene can be also attributed to the decrease in the liquid density, and the concomitant decrease in the refractive index is shown by the Lorentz-Lorenz relation. The apparent behavior of the temperature-induced band broadening of CC bonds can be associated with the decrease of difference in C–C and C=C bond lengths, and the shorter vibrational relaxation time. The shoulder observed below 1520 cm−1 shows a red shift. The enhancement of coherent weakly-damped CC stretching vibrations may increase the Raman scattering cross-section.%　　本文测量了全反式β胡萝卜素在二甲基亚砜中81—25◦C范围的紫外—可见吸收和拉曼光谱。结果表明，随温度降低，紫外—可见吸收光谱、拉曼光谱都发生红移，拉曼光谱线型变窄，散射截面增加这些现象的发生是由于随温度降低，β胡萝卜素分子的热无序降低、分子结构有序性增加、π电子离域扩展，有效共轭长度增加，分子的电子能隙变窄。另外，随着温度的降低，溶剂密度增加，由Lorentz-Lorenz关系得知相伴的折射率增加，从而引起吸收光谱的红移。 CC键键长增加，使CC键拉曼光谱红移；振动弛豫时间变长，各CC键之间的键长差减小，线宽变窄；但由于声子，π电子耦合加强使CC键拉曼线型不对称程度增加，低频端“肩”扩展， CC键的弱阻尼相干振动增加，使拉曼散射截面增加。