Bis­(2-hy­droxy­eth­yl)ammonium 2-bromo­phenolate

In the crystal structure of the 1:1 title salt, C₄H₁₂NO₂⁺·C₆H₄BrO⁻, hydrogen-bonding inter­actions originate from the ammonium cation, which adopts a syn conformation. A gauche relationship between the C—O and C—N bonds of the 2-hy­droxy­ethyl fragments also facilitates O—H...O inter­actions of bis­(2-hy­droxy­eth­yl)ammonium cation chains to phenolate O atoms. The resulting double-ion chains along [100] are further linked by N—H...O inter­actions, forming chains parallel to [110].

Hexa­kis­(propyl­ammonium) benzene-1,2,4,5-tetra­carboxyl­ate 2,5-dicarb­oxy­benzene-1,4-carboxyl­ate tetra­hydrate

The title organic salt, 6C₃H₁₀N⁺·C₁₀H₂O₈⁴⁻·C₁₀H₄O₈²⁻·4H₂O, contains seven independent entities in the asymmetric unit which comprises three propyl­ammonium cations, two water mol­ecules, half a 2,5-dicarb­oxy­benzene-1,4-carboxyl­ate dianion (H₂btc²⁻) and half a benzene-1,2,4,5-tetra­carboxyl­ate tetra­anion (btc⁴⁻), the latter two anions being located about centres of inversion. One of the water mol­ecules is disordered over two positions in a 0.55 (2):0.45 (2) ratio. The combination of mol­ecular ions and water mol­ecules results in an extensive and complex three-dimensional network of hydrogen bonds, the network being made up of nine unique N—H...O inter­actions between the ammonium cations and the anions, as well as four unique O—H...O inter­actions between the water mol­ecules and the anions.