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The crystal structure of the anhydrous 1:1 proton-transfer compound of 5-sulfosalicylic acid (3-carboxy-4-hydroxy­benzene­sulfonic acid) with 4-amino­benzoic acid, viz. 4-carboxy­anilinium 3-carboxy-4-hydroxy­benzene­sulfonate, C7H8NO2+·C7H5O6S, displays a hydrogen-bonded polymeric network structure involving primarily all aminium H-atom donors and sulfonate O-atom acceptors, and is propagated through homomolecular cyclic tail-to-tail interactions between the carboxylic acid substituent groups of both cation and anion species. In addition, there are some cation–anion π–π stacking associations.

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The crystal structure of cytosinium 3,5-di­nitro­salicyl­icate (systematic name: 6-amino-2-oxo-2,3-di­hydro­pyrimidinium 3,5-di­nitro­salicyl­ate), C4H6N3O+·C7H3N2O7-, shows the presence of a primary heteroionic cyclic R22(8) interaction between the H-atom donors of the protonated cytosinium cation and the carboxyl­ate O-atom acceptors of the 3,5-di­nitro­salicyl­ate anion. Additional peripheral hydrogen-bonding interactions involving all available cytosinium H-atom donors and both phenol and nitro O-atom acceptors of the anion species give a three-dimensional polymeric structure.

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The low-temperature (130 K) crystal structure of the 1:1 proton-transfer compound of 3,5-dinitro­salicylic acid (DNSA) with diethyl­amine, viz. diethyl­aminium 3,5-dinitro­salicylate, C4H12N+·C7H3N2O7, shows the presence of conformationally extended diethyl­aminium cations in which both H atoms of the aminium centres participate in three-centre hydrogen-bonding associations [one R12(4) and the other R12(6)] with carbox­yl, phenol and nitro O-atom acceptors of two separate DNSA anion species [N...O = 2.813 (3)–3.320 (3) Å]. These result in 12-membered cyclic R64(12) associations linking the two sets of hetero-species into discrete centrosymmetric tetra­mers which have no significant peripheral extensions.

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In the title compound (systematic name: 2,3-dimeth­oxy-10-oxostrychnidinium 2-carb­oxy-6-nitro­phthalate dihydrate), C23H27N2O4+·C8H4NO6·2H2O, the carboxylic acid and carboxyl­ate groups of the hydrogenphthalate anions form head-to-tail catemeric chains of strong inter­molecular O—H...O hydrogen bonds [O...O distance = 2.563 (5) Å] along the 21 screw axes parallel to the a axis. The chains further associate with the water mol­ecules, forming sheet structures parallel to (010). The protonated N atom at the 19-position of the brucine mol­ecule forms a peripheral inter­molecular hydrogen bond with the carboxyl­ate group of the anion.

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The low-temperature (130 K) structure of the 1:1 proton-transfer compound of brucine with toluene-4-sulfonic acid (systematic name: 2,3-dimeth­oxy-10-oxostrychnidinium toluene-4-sulfonate trihydrate), C23H27N2O4+·C7H7O3S-·3H2O, has been determined. The asymmetric unit contains two cations, two anions and six molecules of water. Brucinium cations form the familiar undulating head-to-tail ribbon structures, which associate with the toluene-4-sulfonate anions and the water mol­ecules in the inter­stitial cavities through hydrogen-bonding associations involving all available donor and acceptor atoms on all species. The result is a framework polymer structure.

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The crystal structure of the anhydrous 1:1 proton-transfer compound of 5-sulfosalicylic acid (3-carb­oxy-4-hydroxy­benzene­sulfonic acid) with 3-amino­benzoic acid, C7H8NO2+·C7H5O6S, shows heteromeric cyclic R22(8) carboxylic acid dimers formed through hydrogen-bonding inter­actions between the cation and anion species. Aminium–sulfonate N—H...O inter­actions link these dimers into zigzag chains and also give inter­chain associations. Cation–anion π–π ring inter­actions are also present, resulting in a three-dimensional layered polymer structure.
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