Solid + liquid phase equilibria and solid-compound formation in hexafluorobenzene + cyclic hydrocarbons containing one or two π-bonds

Abstract

Solid + liquid phase diagrams have been obtained from cooling and warming curves for the binary systems formed from hexafluorobenzene (C 6F 6) + 1,5-cyclo-octadiene (C 6H 12) and + cyclohexene (C 6H 10). An incongruently melting 1-1 addition compound forms in C 6F 6 + C 8H 12. For C 6F 6 + C 6H 10 there is no compound formation. Exploratory measurements show the presence of a solid addition compound in C 6F 6 + 1,3 cyclohexadiene (C 6H 8). The relative stability of the compounds that form is as expected if bonding results from charge transfer with the C 6F 6 acting as an electron acceptor and the π-bonded component as an electron donor.