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In the structure of the hydrated 1:1 compound of 4-chloroaniline withl-tartaric acid, C6H7ClN+·C4H5O6−·H2O, determined at 130 K, the asymmetric unit comprises two 4-chloroanilinium cations, two hydrogen tartrate anions and two water molecules of solvation, and forms a two-dimensional duplex substructure comprising head-to-tail C11(7) hydrogen-bonded hydrogen tartrate anions and water molecules. The π-associated 4-chloroanilinium cation pairs [ring centroid separation = 3.576 (4) Å; inter-ring dihedral angle = 0.5 (1)°] are accommodated within the channels of the substructure and are hydrogen-bonded to it peripherally. [ABSTRACT FROM AUTHOR]

Abstract: The complexes of 3-carboxy-4-hydroxybenzenesulfonic acid (5-sulfosalicylic acid, H3SSA) with rubidium(I), caesium(I) and lead(II) have been synthesized and characterized using single-crystal X-ray methods at 130K. The rubidium(I) complex 1, [Rb3(H2SSA)(HSSA)(H2O)4] n , is an unstable hydrate variant of a previously described complex [Rb(H2SSA)(H2O)] n , and comprises three independent and different seven-coordinate metal polyhedra interlinked through oxygen donors of the sulfonate, carboxylate and phenolate groups of the 5-sulfosalicylate ligands (one of which is dianionic, the other monoanionic), and one bridging water, giving a three-dimensional hydrogen-bonded framework polymer structure. The anhydrous caesium(I) complex 2 [Cs(H2SSA)] n , which has been previously described in a room-temperature determination, has a three-dimensional framework polymer structure based on an irregular Cs–O9 repeating unit. Complex 3 with lead(II), [Pb(H2SSA)2(H2O)] n , forms helical step-polymer ribbon substructures having an irregular Pb–O7 coordination centre comprising a single monodentate water and six sulfonate-O donors bridging three separate metals. The carboxylic acid and phenol substituent groups of the 5-sulfosalicylate ligand link the ribbons peripherally through hydrogen bonds, giving a three-dimensional layered framework polymer structure. [Copyright &y& Elsevier]

The structure of the title, compound C23H27N2O4+·C8H5O4−·3H2O, has been determined at 130 K. The hydrogen isophthalate anions and the water mol­ecules (one of which is disordered over two approximately equal sites) associate through extensive hydrogen-bonded inter­actions, including those with the common undulating brucinium cation layer substructures, forming a three-dimensional framework structure. [ABSTRACT FROM AUTHOR]