Neutron diffraction, namely when scanning the wide-angle range, turns out to be a suitable tool for studying the crystalline organization of co-crystals prepared from polymers or supramolecular polymers with appropriate solvents. The generic name for these systems is “molecular compound” from the terminology used in temperature-concentration phase diagrams but they can also be named crystallo-solvates, inclusion compounds, intercalates, clathrates, molecular complexes, and the like. These systems are often observed in thermoreversible gels from polymer and in organogels from supramolecular polymer.
