Isopropyl 2,2-bis­(4-bromo­phen­yl)-2-hy­droxy­acetate

The title compound, C₁₇H₁₆Br₂O₃, which is a restricted commercial acaricide (common name bromo­propyl­ate), has two independent and conformationally similar mol­ecules in the asymmetric unit [dihedral angles between the planes of the two phenyl rings = 68.7 (4) and 77.4 (5)°]. The C atoms of the isopropyl group of one of the mol­ecules are disordered over two sites with occupancies of 0.638 (16) and 0.362 (16). Minor non-merohedral twinning was also present in the crystal. Inter­molecular O—H...O hydrogen-bonding inter­actions involving the hy­droxy groups and carboxyl O-atom acceptors give separate centrosymmetric homodimers through cyclic hydrogen-bonding motifs [graph set R₂²(10)].

Quinolinium 8-hy­droxy-7-iodo­quinoline-5-sulfonate 0.8-hydrate

In the crystal structure of the title hydrated quinolinium salt of ferron (8-hy­droxy-7-iodo­quinoline-5-sulfonic acid), C₉H₇N⁺·C₉H₅INO₄S⁻·0.8H₂O, the quinolinium cation is fully disordered over two sites (occupancy factors fixed at 0.63 and 0.37) lying essentially within a common plane and with the ferron anions forming π–π-associated stacks down the b axis [minimum ring centroid separation = 3.462 (6) Å]. The cations and anions are linked into chains extending along c through hy­droxy O—H...O and quinolinium N—H...O hydrogen bonds to sulfonate O-atom acceptors which are also involved in water O—H...O hydrogen-bonding inter­actions along b, giving a two-dimensional network.