CAJ | 학술논문

采用金刚石对顶砧高压装置,在室温下对D,L-扁桃酸( C8 H8 O3)进行了原位高压拉曼光谱研究,实验最高压力为2.2 GPa.结果表明,原来的一些拉曼峰在0.6 GPa左右突然消失或者劈裂,并同时出现了一些新的拉曼峰.通过进一步分析D,L-扁桃酸的拉曼频率随压力的变化,发现许多拉曼峰的移动在0.6 GPa时都出现了拐点. D,L-扁桃酸在0.6 GPa发生了由正交相( Pbca)到单斜相( P21/c)的压致结构相变.通过分析相变前后晶体结构及拉曼振动模式的变化,认为此压致结构相变是由高压下分子的密堆积效应和氢键结构的重新排列导致.完全卸压至常压后,卸压拉曼光谱与常压拉曼光谱一致,表明此压致相变可逆.
채용금강석대정침고압장치,재실온하대D,L-편도산( C8 H8 O3)진행료원위고압랍만광보연구,실험최고압력위2.2 GPa.결과표명,원래적일사랍만봉재0.6 GPa좌우돌연소실혹자벽렬,병동시출현료일사신적랍만봉.통과진일보분석D,L-편도산적랍만빈솔수압력적변화,발현허다랍만봉적이동재0.6 GPa시도출현료괴점. D,L-편도산재0.6 GPa발생료유정교상( Pbca)도단사상( P21/c)적압치결구상변.통과분석상변전후정체결구급랍만진동모식적변화,인위차압치결구상변시유고압하분자적밀퇴적효응화경건결구적중신배렬도치.완전사압지상압후,사압랍만광보여상압랍만광보일치,표명차압치상변가역.
In situ Raman spectra of D,L-mandelic acid were characterized under high pressure generated by diamond anvil cell at room temperature. The pressure was up to 2. 2 GPa. Around 0.6 GPa, some original Raman peaks disappear or split, and some new Raman peaks emerge. Within the experimental pressure range, the curve of Raman frequence-pressure presented inflexions at 0.6 GPa, indicating a phase transition from Pbca to P21/c for D,L-mandelic acid has occurred at this pressure. On total release of pressure, the Raman spectra returns to its initial state, implying this transition is reversible.