The position of the amino group on the ammonium salt plays a key role in the supramolecular structure and conformation of the crown ether.

Because of the differences in the position and degree of fluorine substitution, four fluorinated DSA derivatives, namely 4-BFSA, 3-BFSA, BDFSA and BTFSA, display different crystal packing and photophysical properties in the solid state.

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Despite a myriad of investigations have been performed both experimentally and theoretically, water remains not fully understood. Here, a new two‐dimensional (2D) supramolecular ice layer, which containing (H2O)6 hexagonal rings with “quasi‐chair” conformation, has been templated by an organic carboxylic host 1‐methyl‐4‐imidazole‐carboxylic acid. This unique infinite 2D ice layer, which is almost identical to ice Ih, packed into three‐dimensional architecture via hydrogen bonding contacts regulated by 1D chains of organic hosts, giving a slit‐width between adjacent layers of about 1.2 nm (12 Å).

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