(THALLIUM(I) NORMAL-TETRADECANOATE + NORMAL-TETRADECANOIC ACID) PHASE-DIAGRAM - FORMATION OF A MOLECULAR-COMPLEX

The mixture {xC13H27CO2Tl + (1 - x)C13H27CO2H} has been investigated by d.s.c. and hot-stage polarizing-light microscopy over the whole range of x. The main features of this phase diagram, determined by measuring the temperatures of transition and plotting the corresponding ΔtrsHm against x are: a eutectic at x ≈ 0.12 and a temperature 2 K below the melting temperature of the pure acid; the formation of a 1-1 molecular complex between the salt and the acid, which undergoes a solid-to-solid phase transition at about 338 K and melts incongruently at about 340 K (peritectic); and a region at T > 374 K and x ≥ 0.70 in which the mixture shows lyotropic mesomorphism. © 1991 Academic Press Limited All rights reserved.