Raman Spectroscopic Study on High Pressure-induced Phase Transition of D,L-Mandelic†

doi:10.7503/cjcu20140417

Abstract

Abstract:

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.

Key words: D, L-Mandelic acid, Diamond anvil cell, Raman spectrum, High pressure, Phase transition

CLC Number:

TrendMD:

WANG Kai, WANG Qinglei, YAN Tingting, LIN Aolei. Raman Spectroscopic Study on High Pressure-induced Phase Transition of D,L-Mandelic^†[J]. Chem. J. Chinese Universities, 2015, 36(2): 381.

Figures/Tables 4

Fig.1 Low frequency Raman spectra(A) and Raman shifts(B) of D,L-mandelic recorded at different pressuresThe arrows denote the appearing of new peaks, the vertical dashed line represents the boundary of the two phases.

Fig.2 Raman spectra(A) and Raman shifts(B) of D,L-Mandelic between 200 and 900 cm-1 recorded at different pressuresThe up-arrows denote the appearing of new peaks, the vertical dashed line represents the boundary of the two phases.

Fig.3 Raman spectra(A, B) and Raman shifts(C) of D,L-Mandelic between 1650 and 3500 cm-1 recorded at different pressures The star denotes the splitting of original peaks, the arrow denotes the appearing of new peaks, and the vertical dashed line represents the boundary of the two phases.

Fig.4 Crystal structures and molecular arrangements of D,L-mandelic at ambient pressure(A) and high pressure(B), respectively The blue dotted lines represent the intermolecular hydrogen bonds.

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