CAJ | 학술논문

通过原位高压紫外-可见吸收光谱研究了2种溶剂(水溶液和体积比为4：1的甲醇-乙醇混合溶液)中亚甲基蓝( MB)分子聚集平衡状态的变化.采用金刚石对顶砧原位高压实验装置，在不同压力下测量亚甲基蓝溶液的吸收光谱，最高实验压力分别达到0.8 GPa(水溶液)和8.7 GPa(甲醇-乙醇溶液).结果表明，随着压力的上升，亚甲基蓝溶液中单体分子和二聚体的吸收峰强度比不断下降，说明高压可以促进二聚体的形成，使亚甲基蓝溶液中分子的单体-二聚体动态平衡过程向二聚体方向移动.卸压后，亚甲基蓝溶液吸收光谱的强度降低，但吸收峰的强度比及峰位恢复到加压前的状态，表明高压下分子聚集平衡状态的变化是可逆的.
통과원위고압자외-가견흡수광보연구료2충용제(수용액화체적비위4：1적갑순-을순혼합용액)중아갑기람( MB)분자취집평형상태적변화.채용금강석대정침원위고압실험장치，재불동압력하측량아갑기람용액적흡수광보，최고실험압력분별체도0.8 GPa(수용액)화8.7 GPa(갑순-을순용액).결과표명，수착압력적상승，아갑기람용액중단체분자화이취체적흡수봉강도비불단하강，설명고압가이촉진이취체적형성，사아갑기람용액중분자적단체-이취체동태평형과정향이취체방향이동.사압후，아갑기람용액흡수광보적강도강저，단흡수봉적강도비급봉위회복도가압전적상태，표명고압하분자취집평형상태적변화시가역적.
The monomer-dimer equilibrium of methylene blue( MB) in two different solvents[ deionized water and 4:1(volume ratio) methanol-ethanol] was studied by in situ high pressure UV-Vis absorption spectrosco-py. Using diamond anvil cell, the highest pressure conducted in the experiments was about 0. 8 GPa in water and 8. 7 GPa in methanol-ethanol solvent. The absorbance ratio of monomer to dimer decreased with the in-crease of pressure, indicating that high pressure can promote dimerization of MB. On release of pressure, the intensity of the peak did not return to original state, but the absorbance ratio of monomer to dimer returned to the initial value, showing that the changes of the absorption spectra under high pressure are reversible.