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Vapour pressures and heats of mixing have been measured for mixtures of dioxan (A) and chloroform (B) at SO" C. The results have been satisfactorily interpreted by assuming the existence of the four species A, AB, A B 2 and B in mutual equilibrium and by further assuming that these four species mix ideally. Values are given for the equilibrium constants and heats of formation of AB and AB2.Several systems, such as ether + chloroform and acetone + chloroform, in which the formation of a complex of type AB is believed to occur through the formation of a hydrogen bond between the hydrogen of the chloroform and the oxygen of the other molecule, have been made the subjects of thermodynamic study.1-5 However, we know of no previous thermodynamic investigation of a liquid mixture in which any other type of complex formation would be expected.

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Fractal growth, growth kinetics, and electrical conductivity of aggregates obtained during electropolymerization in the systems (A) pyrrole-4-toluene sulfonic acid silver salt (4-TSS)-acetonitrile, (B) pyrrole-4-TSS-ZnSO(4)-acetonitrile, and (C) pyrrole-4-TSS-aniline-acetonitrile were investigated. In the case of system (A), effect of [4-TSS], [pyrrole], field intensity, and solvents H(2)O and CH(3)OH on morphology, fractal character, and growth kinetics was also studied. Fractal growth data were examined in detail. During studies on system (A), electric potential oscillations were observed and subjected to detailed study. The results indicate that fractal growth pattern and electric potential oscillations are inter-related. The mechanism of development of fractal growth, dendritic structure, and electric potential oscillations is discussed in terms of diffusion-limited aggregation and modified Diaz's mechanism, which explains the random movement of radical cations.

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