Raman spectroscopic investigation of the dynamics of urea-water complexes

Abstract

The hydration of urea via hydrogen-bond formation was found to have a significant effect on the observed Raman band shapes. An analysis indicates that, on the average, one molecule of water is carried along with a solute molecule during its reorientational motion (TR≈2.5 ps). Vibrational dephasing of the v4 vibration (T ω≈0.2 ps) is independent of concentration and appears to decrease slightly with increasing temperature. No evidence of urea dimer formation was detected. © 1993 American Institute of Physics.