Abstract
Single-crystal samples of L-histidine hydrochloride monohydrate (LHICL),
C6H9N3O2.HCl.H2O, were studied by Raman spectroscopy at temperatures
ranging from 295 to 40K over the spectral range 20-3400 cm(-1). A
tentative assignment of the bands is given. The effect of temperature
change on the vibrational spectrum is discussed. The behavior of the
Raman spectra, in particular the emergence of new modes in the
low-wavenumber region, indicates that LHICL undergoes a structural phase
transition between 140 and 110 K. There are further indications that,
possibly, a second change of structure occurs for temperatures between
80 and 60 K. Copyright (C) 2004 John Wiley Sons, Ltd.
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