Supramolecular assembly in molecular solids is determined not only by the molecular structure and intermolecular interactions, but also various environmental f actors such as the temperature, pressure and humidity, as well as the specif ic stages f ollowed during the crystallization process. Crystalline molecular organization is of ten promoted by structural f eatures such as aromatic rings and H-bonding interactions that lead to -stacking and orientational ordering of the constituent units. On the other hand, steric f actors that hinder orderly packing, conf ormational lability of substituent groups, and non-directional intermolecular f orces such as the London dispersion, can f avor amorphous aggregation of molecules. A subtle balance of aromatic ring stacking, Coulombic interactions of molecular dipoles and orientational f lexibility of groups such as alkyl or alkoxyalkyl can lead to the f ormation of molecular solids with bistable existence in amorphous/crystalline (A/C) states under specif ic conditions. Study of such novel entities will be signif icantly aided if a f unctional attribute of the material is sensitively dependent on the A or C nature of the molecular assembly. Table . Full and abbreviated names of the ROR′-DADQs investigated in this study. Abbreviation is based on the number of carbons in R and R′ moieties in the alkoxyalkyl group (the molecular structure is shown in Figure ). Please do not adjust margins