1,4-Phenylenediboronic acid

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.