V. Crupi et al., Anharmonic effects and vibrational dynamics in H-bonded liquids by attenuated total reflectance FT-IR spectroscopy, J PHYS CH A, 104(17), 2000, pp. 3933-3939
In the present work IR measurements as a function of temperature, performed
, in the (2500-3700) cm(-1) region, on ethylene glycol (EC) and its homolog
ous systems, namely ethylene glycol monomethyl ether (EGmE) and ethylene gl
ycol dimethyl ether (EGdE), are presented and discussed. The goal is to ana
lyze the evolution of the O-H stretching fundamental band in a wide range o
f temperature for systems having identical chemical structure except for th
e number of hydroxyl end groups, clarifying in this way the processes chara
cterizing the vibrational dynamics of these I-I-bonded liquids. In particul
ar, the O-H stretching band shape, through a quantitative study performed w
ith FT-IR in the attenuated total reflectance geometry, has been connected
to the different transient local environments of hydrogen-bonded molecular
groups, and the role played by inter-and intramolecular interactions discus
sed within the framework of current theories for associated liquids. In add
ition, temperature-induced isosbestic points observed in the IR spectra for
liquid EG and EGmE are analyzed in terms of a simple two-state model.