1. Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland, Department of Physical Chemistry, University of Łódź, Pomorska 165, 90-236 Łódź, Poland, Laboratory of Thermodynamics of Solutions and Polymers, Blaise Pascal University of Clermont-Ferrand, F-63177, Aubière, France, and Institute of Physical Chemistry, University of Wien, Währinger Strasse 42, A-1090 Wien, Austria