Chemistry that holds water: A honeycomblike water sheet having a hitherto unknown structure is described. The crystal lattice of bulk water in the presence of 1,4‐phenylenediboronic acid (see picture) contains hexameric rings with chair and boat conformations. The hydrogen‐bonding pattern is completely elucidated and gives two different motifs for each of the three independent hydrogen‐bonded rings.

In the crystal structure of the title compound, C6H8B2O4, centrosymmetric 1,4‐phenyl­enediboronic acid mol­ecules are linked by characteristic hydrogen bonding of B(OH)2 groups. Primary association involves the formation of centrosymmetric cyclic dimers which leads to the formation of linear chains; these, in turn, associate by secondary hydrogen bonding, via unit‐cell translations in the a axis direction, to form sheets.

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