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Raman spectroscopy studies of the OH stretching band of aqueous solutions of short poly(oxyethyelene) C2E2C2

Previous studies of OH stretching band of aqueous solutions of short poly(oxyethylene)s POEs showed similarities between ratios R of the intensities of the component around 3200 cm-1 (the collective in-phase OH stretching vibrations of hydrogen-bonded aggregates) and the component around 3400 cm-1 (the out of phase OH stretches) in dependence on type and concentration of dissolved POEs. According to previous studies on C1EnE1 (n=1-4) the intensity ratio R is characterized with two minima. We observed the same behavior in the case of C2E2C2. In addition the perfect match of the spectra of C2E2C2 and those of C1EnE1 (n=1-4) at different concentration showed that the water structure is influenced in a similar way in the case of C2E2C2 and of C1EnC1.