caa a22 4500 47576336X CHVBK 20180406123557.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1007/s003960050002 doi (NATIONALLICENCE)springer-10.1007/s003960050002 Complexation in the heptanoic acid-heptylamine system [Elektronische Daten] [S. Karlsson, S. Backlund, R. Friman] The complexation between heptylamine and heptanoic acid has been elucidated at 298.15 K using spectroscopic methods and also by measuring macroscopic quantities such as viscosity, conductivity and surface tension. Fourier transform IR and 13C NMR measurements point towards the existence of a compound consisting of one amine molecule and one acid molecule in an equimolecular mixing ratio. These suggestions are supported by viscosity and surface tension measurements. This compound is further able to interact with excess acid, but similar behaviour is not observed with excess amine. The equimolecular compound behaves like a catanionic surfactant; this is seen in the phase diagram for the heptylamine-heptanoic acid-water system at 298.15 K, where the dominating phase is the lamellar liquid-crystalline phase. This phase is in equilibrium with almost pure water. At low water content a solution phase extending from the binary heptylamine-heptanoic acid axis and covering all mixing ratios between the amine and the acid is also present. Springer-Verlag Berlin Heidelberg, 2000 Key words Alkanoic acid nationallicence Alkylamine nationallicence Catanionic surfactant nationallicence Ternary phase diagram nationallicence Karlsson S. Department of Physical Chemistry Åbo Akademi University Porthaninkatu 3-5 FIN-20500 Turku, Finland e-mail: jkarlsso@abo.fi, FI aut Backlund S. Department of Physical Chemistry Åbo Akademi University Porthaninkatu 3-5 FIN-20500 Turku, Finland e-mail: jkarlsso@abo.fi, FI aut Friman R. Department of Physical Chemistry Åbo Akademi University Porthaninkatu 3-5 FIN-20500 Turku, Finland e-mail: jkarlsso@abo.fi, FI aut https://doi.org/10.1007/s003960050002 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050002 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Karlsson S. Department of Physical Chemistry Åbo Akademi University Porthaninkatu 3-5 FIN-20500 Turku, Finland e-mail: jkarlsso@abo.fi, FI aut NATIONALLICENCE 700 1- Backlund S. Department of Physical Chemistry Åbo Akademi University Porthaninkatu 3-5 FIN-20500 Turku, Finland e-mail: jkarlsso@abo.fi, FI aut NATIONALLICENCE 700 1- Friman R. Department of Physical Chemistry Åbo Akademi University Porthaninkatu 3-5 FIN-20500 Turku, Finland e-mail: jkarlsso@abo.fi, FI aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer