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The crystal structure of [Co(NH 3 ) 6 ](ADC)(HADC) · 2H 2 O (1) (ADC 2-  =acetylenedicarboxylate) (P2 1 =n, Z = 4) was mistakenly described as containing the [Co(H 2 O) 6 ] 3+  ion [I. Stein, U. Ruschewitz, Z. Naturforsch. , 66b, 471 - 478]. A revision is reported. While attempting to reproduce 1, we isolated phase-pure crystalline material of [Co(NH 3 ) 6 ]Cl 2 (HADC) · H 2 O (2), the crystal structure of which was also reported in the article above. Upon standing in the aqueous mother liquor at room temperature for several days, the needle-shaped crystals of 2disappear, while blockshaped crystals of the formerly unknown compound [Co(NH 3 ) 6 ](ADC)(HADC) (3) grow. Satellite peaks in the X-ray diffraction frames indicate that the crystal structure is incommensurately modulated. Dissolving crystals of 3 in water at elevated temperature leads to plate-shaped crystals of the new compound [Co(NH 3 ) 6 ] 2 (ADC) 3  · 3H 2 O (4) upon slow cooling to room temperature. Compounds 2- 4 were investigated by elemental analysis, powder X-ray diffraction and infrared spectroscopy. Structural characterization of 4 by single-crystal X-ray analysis was also achieved (P1̅ , Z = 2). Complex 1, however, could not be reproduced

Structural Diversity of Hydrogen-Bonded Networks of [Co(NH 3 ) 6 ] 3+ Complex Cations and Acetylenedicarboxylic Acid Anions