caa a22 4500 477139329 CHVBK 20180405111728.0 cr unu---uuuuu 170330e19971001xx s 000 0 eng 10.1007/BF02768054 doi (NATIONALLICENCE)springer-10.1007/BF02768054 Isotope effects on thermodynamic properties in four binary systems: Water (or heavy water) + dimethylsulfoxide (or N,N-Dimethylformamide) at 25‡C [Elektronische Daten] [Koichi Miyai, Masanori Nakamura, Katsutoshi Tamura, Sachio Murakami] Excess enthalpy, excess isobaric heat capacity, density, and speed of sound in mixtures of heavy water (D2O) + dimethylsulfoxide (DMSO), and D2O + dimethylformamide (DMF) were measured at 25‡C. The same properties of the mixtures of normal water + DMSO, and H2O + DMF were also measured to estimate isotope effects on the thermodynamic excess functions. Both DMSO and DMF are proton acceptors and thus form hydrogen bonds with water. Large negative excess enthalpies and volumes of mixing and excess isentropic compressibilities show that the hydrogen bonding structures of DMSO and DMF with water are stronger and more compact than those in pure water. The excess heat capacity of DMSO-containing mixtures changes sign from negative to positive with increasing water content. The deviations of the excess properties of D2O systems from those of H2O systems indicate that the hydrogen bonding structure with D2O is stronger and more compact. Plenum Publishing Corporation, 1997 Isotope effects nationallicence deuterium oxide nationallicence N,N,-dimethylformamide nationallicence dimethylsulfoxide nationallicence binary mixtures nationallicence Miyai Koichi aut Nakamura Masanori aut Tamura Katsutoshi Department of Chemistry, Faculty of Science, Osaka City University, Osaka 558, 3-3-138, Sugimoto, Sumiyoshi-ku, Japan aut Murakami Sachio aut Journal of Solution Chemistry Springer US 26/10(1997-10-01), 973-988 0095-9782 26:10<973 1997 26 10953 https://doi.org/10.1007/BF02768054 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02768054 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Miyai Koichi aut NATIONALLICENCE 700 1- Nakamura Masanori aut NATIONALLICENCE 700 1- Tamura Katsutoshi Department of Chemistry, Faculty of Science, Osaka City University, Osaka 558, 3-3-138, Sugimoto, Sumiyoshi-ku, Japan aut NATIONALLICENCE 700 1- Murakami Sachio aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US 26/10(1997-10-01), 973-988 0095-9782 26:10<973 1997 26 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer