title: Hydration modes of an amphiphilic molecule: NMR, FTIR, and theoretical study of the interactions in the water-lutidine system.
abstract: Using (1)H and (13)C NMR spectra and relaxations, PFG NMR diffusion measurements, FTIR spectra, and quantum-chemical structure predictions and optimizations on the MP2/6-31G(d) level, we have studied interactions between water (W) and lutidine (2,6-dimethylpyridine, L) in a wide range of ratios. At low W content up to 35%, W was found to bind to L by an O-H***N hydrogen bond and form transient L-W aggregates containing two to four L molecules in cooperation with two to three other W molecules. At higher W content, these aggregates are gradually cleaved to single L molecules enwrapped by a hydration shell anchored in an O-H***N hydrogen bond. At all compositions of the mixture, the various hydrate forms are in fast mutual exchange with a correlation time on the order of 1 x 10(-5) s.
authors: Institute of Macromolecular Chemistry AS CR, 162 06 Prague, Czech Republic.
authors: Jaroslav
authors: J
authors: Kríz
authors: Jirí
authors: J
authors: Dybal
authors: Zdenek
authors: Z
authors: Tuzar
authors: Petr
authors: P
authors: Kadlec