| Abstrakt: |
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, (II a), is in very good agreement with the synchrotron X-ray determination, (II b). When differences in data collection temperatures are taken into account, even the displacement parameters are in very good agreement. [ABSTRACT FROM AUTHOR] |
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