Differential scanning calorimetric study of the Transition heats of some dibenzazepines, carbazoles and phenothiazines

The transition temperatures and heats of two dibenzazepines, three carbazoles and three phenothiazines have been obtained. This represents a continuation of an earlier study of a series of acyldibenzazepines. Additional evidence for a back-folded acylchain in the solid state has been developed and good correlation of these bent ring molecules with well known spherical molecules on the basis of transition entropy is possible. The behaviour of the alkyl chain in acyl substituted dibenzazepines, carbazoles and phenothiazines is contrasted with other alkyl substituted ring systems. © 1972.