Molecular associations in nonaqueous solvents. I. Thermodynamics of dye-dye interactions in carbon tetrachloride and benzene

Abstract

Figure 2. Expanded graph of activity of water at low THF concentrations occurred in the melting point of the hydrate (4, 10), the viscosity (9), and the freezing rate (8) of the solutions. However, the accuracy of the data is not sufficient to make any definitive statement about this phenomena.

Aggregative Properties of Water-soluble Metal Phthalocyanines in a Borate Buffer Solution

“…We could find a single work in the literature, where thermodynamic characteristics of process (1) for sulfo-substituted copper(II) phthalocyanine [20] have been determined by calorimetric and spectral methods [21]. The resulting data astonishingly well fit each other.…”

“…The resulting data astonishingly well fit each other. Critical analysis of the calorimetric experiment in [20] revealed a number of methodical errors that might give rise to such results. In the referred calorimetric experiment, a 0.01 M solution of sulfo-substituted copper(II) phthalocyanine was used as initial on the assumption that such a supersaturated solution of MPc contains no higher aggregates.…”

Molecular associations in nonaqueous solvents. II. Temperature effects on thermodynamics of dye-dye interaction in benzene

“…The calorimetric data seem to indicate that the solvated monomer is stabilized as the temperature is increased. At 25°C the enthalpy of dimerization Is -10.0 kcal/mol (4), but at 35.0°C the enthalpy of dimerization is -12.0 kcal/mol. From the two enthalpies, a value for ACP°may be calculated from Equation 16:…”

“…Until recently, little work has been done on the dimerization of metal (I I) phthalocyanine dyes in nonaqueous solvents (4)(5)(6). Previously, work has been reported for the dimerization of metal (II) phthalocyanine (7, 2, 8, 9), for cyanine (10,11), and for arylazonaphthol (7) dyes in aqueous solutions.…”