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Structural and dynamical properties of glucose aqueous solutions by depolarized Rayleigh scattering
Author(s) -
Paolantoni Marco,
Comez Lucia,
Fioretto Daniele,
Gallina Maria Elena,
Morresi Assunta,
Sassi Paola,
Scarponi Filippo
Publication year - 2008
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1909
Subject(s) - aqueous solution , rayleigh scattering , picosecond , raman spectroscopy , chemistry , intermolecular force , hydrogen bond , relaxation (psychology) , raman scattering , diffusion , sugar , chemical physics , molecular dynamics , analytical chemistry (journal) , molecule , computational chemistry , thermodynamics , optics , organic chemistry , laser , social psychology , psychology , physics
Depolarized Rayleigh scattering (DRS) spectra of glucose aqueous solutions measured from 0.01 to 1000 cm −1 reveal the presence of two distinct relaxation processes, in addition to the intermolecular Raman modes of the water network. The slow relaxation process with a characteristic time of tens of picoseconds is due to the glucose rotational diffusion and is spectrally separated from the fast relaxation process at picosecond time scales commonly attributed to the hydrogen‐bond lifetime; this latter time clearly increases with increase in glucose concentration. This suggests the formation of stable sugar hydration shells where the water dynamics is slower than the bulk. The destructuring effect on the tetrahedral hydrogen bonding of water induced by the sugar is also clearly evidenced when comparing the intermolecular Raman spectra at different molar ratios. Copyright © 2008 John Wiley & Sons, Ltd.