MOLECULAR SELF-ASSEMBLY IN THE SOLID-STATE - THE COMBINED USE OF SOLID-STATE NMR AND DIFFERENTIAL SCANNING CALORIMETRY FOR THE DETERMINATION OF PHASE CONSTITUTION

The construction and use of phase diagrams for the study of self-assembled systems are extremely useful. While well-known in various fields of metallurgy, phase diagrams have not been widely applied to multicomponent organic systems of contemporary interest. The blending of hydroquinone (1) with bis(N,N-diethyl)terephthalamide (2) or bis(NN-dimethyl)terephthalamide (3) in the solid state has been demonstrated to generate stable binary phases as determined by both solid-state NMR and differential scanning calorimetry. Compounds 1 and 2 form a single phase of a 1:1 composition, while compounds 1 and 3 form two stable phases, one of a 1:1 composition and the other of a hydroquinone/terephthalamide composition of 2:1. Phase diagrams of these systems are constructed and structural features discussed.