ASYMMETRIC-TO-CENTROSYMMETRIC STRUCTURE CHANGE OF MOLECULES IN SQUARIC ACID CRYSTAL - EVIDENCE FOR PRESSURE-INDUCED CHANGE OF CORRELATED PROTON POTENTIALS

被引：26

作者：

MORITOMO, Y

KOSHIHARA, S

TOKURA, Y

机构：

[1] Department of Physics, University of Tokyo

来源：

JOURNAL OF CHEMICAL PHYSICS | 1990年 / 93卷 / 08期

关键词：

D O I：

10.1063/1.459639

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

High-pressure effects on vibrational modes have been investigated in crystals of squaric acid H2C4O4 (H 2SQ) and its deuterated analog (D2SQ) which show two-dimensional networks of hydrogen bonds. Specific vibrational modes in Raman and infrared spectra were observed to anomalously disappear with the application of pressures above 30 kbar in H2SQ, but not in D2SQ, indicating that the H2SQ molecule in crystal shows the asymmetric (C1h)-to-centrosymmetric (C4h) structure change. This is possibly caused by pressure-induced deformation of the correlated proton potential essentially from the double-well to single-well type. © 1990 American Institute of Physics.

引用

页码：5429 / 5435

页数：7

共 21 条

[1]

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[2] O-H VS O ... O DISTANCE CORRELATION, GEOMETRIC ISOTOPE EFFECT IN OHO BONDS, AND ITS APPLICATION TO SYMMETRIC BONDS [J].