Comprehensively understanding the distinct properties of crystal structure, phase transition and dielectrics in [M(crown)n]ReO4 (M+ = Na+, K+, NH4+; crown = 15-crown-5, 18-crown-6; n = 1 or 2)

Supramolecular salts exhibit distinct crystal structures, phase transitions and dielectric properties, stemming from the compatibility between M + (Na + , K + and NH 4 + ) radii and crown-ether ring sizes.