The investigation of hydrophobic hydration effects

The results of neutron scattering experiments on [CH3](4)NCl (2 M), [C4H9]( 4)NCl (1 M) and [C6H5](4)PCl (0.3 M) aqueous solutions are presented. The g eneralised frequency distributions (GFD) for water molecules hydrating [C4H 9](4)N+ and [C6H5](4)P+ ions were obtained from the neutron scattering spec tra. These data were compared with the results of ionic hydration previousl y obtained for LiCl (Novikov et al., Chem. Phys. Lett. 259 (1996) 391) and CsCl (Novikov et al., Physica B 234-236 (1997) 340) solutions. The comparis on of GFD of hydration water molecules and GFD of pure water gives informat ion concerning the ion influence on the rotation-vibration motions of surro unding water molecules and provides the data about changes in hydrogen-boun ds network structure. The difference between the effects of ionic and hydro phobic hydration is discussed. (C) 2000 Elsevier Science B.V. All rights re served.