Comparison of conventional and synchrotron X-ray structure determinations of the adduct 1,2,4,5-tetrahydroxybenzene–2,5-dihydroxy-1,4-benzoquinone (1/1) and a conventional X-ray structure determination of 1,2,4,5-tetrahydroxybenzene monohydrate

The X-ray structure of 1,2,4,5-tetra­hydroxy­benzene (benzene-1,2,4,5-tetrol) monohydrate, C6H6O4·H2O, (I), reveals columns of 1,2,4,5-tetra­hydroxy­benzene parallel to the b axis that are separated by 3.364 (12) and 3.453 (11) Å. Molecules in adjacent columns are tilted relative to each other by 27.78 (8)°. Water mol­ecules fill the channels between the columns and are involved in hydrogen-bonding interactions with the 1,2,4,5-tetra­hydroxy­benzene mol­ecules. The crystal structure of the adduct 1,2,4,5-tetra­hydroxy­benzene–2,5-di­hydroxy-1,4-benzo­quinone (1/1), C6H6O4·C6H4O4, (II), reveals alternating mol­ecules of 1,2,4,5-tetra­hydroxy­benzene and 2,5-di­hydroxy-1,4-benzo­quinone (both lying on inversion centers), and a zigzag hydrogen-bonded network connecting mol­ecules in three dimensions. For compound (II), the conventional X-ray determination, (IIa), is in very good agreement with the synchrotron X-ray determination, (IIb). When differences in data collection temperatures are taken into account, even the displacement parameters are in very good agreement.