Diamond anvil cells combined with Raman spectroscopy and angle-dispersive x-ray diffraction(ADXRD) were used to investigate the compression behavior of cinchomeronic acid(C_7H_5NO_4, CA), a hydrogen-bonded polymorphs....Diamond anvil cells combined with Raman spectroscopy and angle-dispersive x-ray diffraction(ADXRD) were used to investigate the compression behavior of cinchomeronic acid(C_7H_5NO_4, CA), a hydrogen-bonded polymorphs. The compression of form-I at approximately 6.5 GPa caused an irreversible phase transition that produced the new polymorph form-III. Lattice and internal modes in the Raman spectra were analyzed to determine the modifications in the local environment of CA form-I molecules. The form-III was indexed and refined to a low-symmetry triclinic structure with space group P1. The mechanism for the phase transition involved the reconstructions in the hydrogen-bonded networks in CA form-I.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11604224,51805336,and 11774120)the Open Project of State Key Laboratory of Superhard Materials of Jilin University,China(Grant No.201708)+2 种基金the Natural Science Foundation of Liaoning Province,China(Grant No.20180550861)the Education Department of Liaoning Province,China(Grant Nos.LJZ2016031 and LJZ2016030)Shenyang Jianzhu University Discipline Content Education,China(Grant Nos.XKHY2-105 and XKHY2-101)
文摘Diamond anvil cells combined with Raman spectroscopy and angle-dispersive x-ray diffraction(ADXRD) were used to investigate the compression behavior of cinchomeronic acid(C_7H_5NO_4, CA), a hydrogen-bonded polymorphs. The compression of form-I at approximately 6.5 GPa caused an irreversible phase transition that produced the new polymorph form-III. Lattice and internal modes in the Raman spectra were analyzed to determine the modifications in the local environment of CA form-I molecules. The form-III was indexed and refined to a low-symmetry triclinic structure with space group P1. The mechanism for the phase transition involved the reconstructions in the hydrogen-bonded networks in CA form-I.
