G. Jakli1, A. Baranowski2, K. Jerie2, J. Glinski3, K. Orzechowski3
1 KFKI Atomic Energy Research Institute, H-1525 Budapest 114 P.O. Box 49, Hungary
2Institute of Experimental Physics, Wroclaw University, pl. Maxa Borna 9, 50-204 Wroclaw, Poland,
3 Faculty of Chemistry, Wroclaw University, F. Joliot-Curie 14, 50-383 Wroclaw, Poland
Structure of aqueous solutions of tetra-n-butylammonium bromide was investigated using sound velocity and positron annihilation methods. Surprisingly, the results are different than those obtained earlier for systems where hydrophobic hydration occurs. No evidences for formation of clasthrate-like hydrates in liquid phase were observed. The results are interpreted, among others, in terms of competition between different hydrates of tetrabutylammonium cations, hydration of bromide anions, and cation-cation and cation-anion interactions.