Odd-even Effects of Counter Cation's Carbon Chain Length for Krafft and Melting Points of n-Alkylammonium and α,ω-Alkanediammonium 1-Alkanesulfonates
Hideo AKISADA, Harumi SHIMO, Kazuaki FUKUOKA, Souichi ABE, Shino AKANO and Junko NISHIDA
Department of Environmental Chemistry, Faculty of Engineering, Kyushu Kyoritsu University; 1-8 Jiyugaoka, Yohatanishi-ku, Kitakyushu-shi 807-8585 Japan
The Krafft and melting points of n-alkylammonium and α, ω-alkanediammonium 1-alkanesulfonates were measured by the change of transmittance and the dependence of conductivity on temperature under the coexistance of its solid, respectively. Melting points for these surfactans showed the odd-even changes by the change of carbon chain lengths in their counter cations. The Krafft points for the α, ω-alkanediammonium salts also showed the odd-even changes. The Krafft points for the n-alkylammonium salts did not show clearly the odd-even changes when the carbon number of the counter cation was less than 4 but showed the changes when the carbon number was more than 4. The odd-even changes for their heats of dissolution were obtained by an analogy from the dependence of the conductivities of their saturated solution on temperature. Their odd-even changes were similar to those of Krafft points.
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