Reaction of CoCl₂·6H₂O with pyrazine and disodium terephthalate in water results in the formation of a neutral cavity-containing rectangular grid, [Co(pyz)(terph)(H₂O)₂], which includes a tightly bound aromatic as a guest; classification of these frameworks also provides targets for chemical synthesis.

Co-crystallization of a symmetrical azo bipyridine with isosteric resorcinols affords isostructural co-crystals that exhibit linear thermal expansion along each axis. The thermal expansions involve interplay between intra-layer halogen and hydrogen bonds.

Thermal expansion behavior is tuned by incorporating motion-capable or -incapable molecules into organic solids.