2,3-Dimethyl-1H-imidazol-3-ium benzenesulfonate–1,2-dimethyl-1H-imidazole co-crystal

In the title co-crystal, C5H9N2 +·C6H5O3S−·C5H8N2, the two 1,2-dimethylimidazole rings exist as partially protonated moieties in the asymmetric unit as a two-part disordered unit wherein the acidic hydrogen atom is bound to each ring. The two imidazolium cations share a strong hydrogen bond via the acidic hydrogen atom, which is disordered between two positions, being bonded to the first versus second imidazole ring in a 0.33 (2) to 0.67 (2) ratio. A benzene sulfonate anion is present for charge balance and interacts with the aromatic H atoms on both imidazole rings as well as with the methyl groups on the rings.

The structure and Hirshfeld surface analysis of the salt 3-methacrylamido-N,N,N-trimethylpropan-1-aminium 2-acrylamido-2-methylpropane-1-sulfonate

The title salt, C10H21N2O+·C7H12NO4S−, comprises a 3-methacrylamido-N,N,N-trimethylpropan-1-aminium cation and a 2-acrylamido-2-methylpropane-1-sulfonate anion. The salt crystallizes with two unique cation–anion pairs in the asymmetric unit of the orthorhombic unit cell. The crystal studied was an inversion twin with a 0.52 (4):0.48 (4) domain ratio. In the crystal, the cations and anions stack along the b-axis direction and are linked by an extensive series of N—H...O and C—H...O hydrogen bonds, forming a three-dimensional network. Hirshfeld surface analysis was carried out on both the asymmetric unit and the two individual salts. The contribution of interatomic contacts to the surfaces of the individual cations and anions are also compared.

Co-catalysis over a tri-functional ligand modified Pd-catalyst for hydroxycarbonylation of terminal alkynes towards α,β-unsaturated carboxylic acids

An amphiphilic tri-functional ligand (L1) containing a phosphonium cation, a phosphino-fragment and a hydrophilic sulfonate anion enabled Pd(OAc)2 to co-catalyze hydroxycarbonylation of terminal alkynes towards α,β-unsaturated carboxylic acids.

Crystal structure and Hirshfeld surface analysis of 2,4-diamino-6-phenyl-1,3,5-triazin-1-ium 4-methylbenzenesulfonate

In the title molecular salt, C9H10N5 +·C7H7O3S−, the asymmetric unit consists of a 2,4-diamino-6-phenyl-1,3,5-triazin-1-ium cation and a 4-methylbenzenesulfonate anion. The cation is protonated at the N atom lying between the amine and phenyl substituents. The protonated N and amino-group N atoms are involved in hydrogen bonding with the sulfonate O atoms through a pair of intermolecular N—H...O hydrogen bonds, giving rise to a hydrogen-bonded cyclic motif with R 2 2(8) graph-set notation. The inversion-related molecules are further linked by four N—H...O intermolecular interactions to produce a complementary DDAA (D = donor, A = acceptor) hydrogen-bonded array, forming R 2 2(8), R 4 2(8) and R 2 2(8) ring motifs. The centrosymmetrically paired cations form R 2 2(8) ring motifs through base-pairing via N—H...N hydrogen bonds. In addition, another R 3 3(10) motif is formed between centrosymetrically paired cations and a sulfonate anion via N—H...O hydrogen bonds. The crystal structure also features weak S=O...π and π–π interactions. Hirshfeld surface and fingerprint plots were employed in order to further study the intermolecular interactions.

Sulfonate salts of the therapeutic agent dapsone: 4-[(4-aminophenyl)sulfonyl]anilinium benzenesulfonate monohydrate and 4-[(4-aminophenyl)sulfonyl]anilinium methanesulfonate monohydrate

Dapsone, formerly used to treat leprosy, now has wider therapeutic applications. As is the case for many therapeutic agents, low aqueous solubility and high toxicity are the main problems associated with its use. Derivatization of its amino groups has been widely explored but shows no significant therapeutic improvements. Cocrystals have been prepared to understand not only its structural properties, but also its solubility and dissolution rate. Few salts of dapsone have been described. The title salts, C12H13N2O2S+·C6H5O3S−·H2O and C12H13N2O2S+·CH3SO3−·H2O, crystallize as hydrates and both compounds exhibit the same space group (monoclinic,P21/n). The asymmetric unit of each salt consists of a 4-[(4-aminophenyl)sulfonyl]anilinium monocation, the corresponding sulfonate anion and a water molecule. The cation, anion and water molecule form hydrogen-bonded networks through N—H...O=S, N—H...Owaterand Owater—H...O=S hydrogen bonds. For both salts, the water molecules interact with one sulfonate anion and two anilinium cations. The benzenesulfonate salt forms a two-dimensional network, while the hydrogen bonding within the methanesulfonate salt results in a three-dimensional network.

Novel phosphorus-containing halogen-free ionic liquids: effect of sulfonate anion size on physical properties, biocompatibility, and flame retardancy

Phosphorus-containing sulfonate ILs with different anions size present different thermal stability, solubility, viscosity, melting points, and cytotoxicity. They show flame retardant effect for PA6 via accelerating decomposition of matrix.

Crystal structure of 2,4-diamino-6-oxo-3,6-dihydropyrimidin-1-iump-toluenesulfonate

In the title salt, C4H7N4O+·C7H7O3S−, the 2,6-diamino-4-oxo-1,3-dihydropyrimidin-1-ium cation interacts with the sulfonate group of thep-toluenesulfonate anionviaa pair of N—H...O hydrogen bonds, forming a hetero-synthonR22(8) that mimics the role of a carboxylate. The self-assembled cations form a homo-synthonR21(6) motif which is further linked with the sulfonate anionviaN—H...O hydrogen bonds to generate anR32(10) ring motif. The three motifs are fused together and extended as supramolecular ribbons along theb-axis direction. Adjacent ribbons are further linkedviaN—H...O hydrogen bonds to form an annulus, with anR44(20) ring motif, resulting in a tunnel-like arrangement propagating along [010]. There are slipped parallel π–π stacking interactions [inter-centroid distance = 3.6539 (7) Å], between the tunnel-like polymer chains, forming slabs parallel to (100).

Correction: Aromatic sulfonate anion-induced pseudorotaxanes: environmentally benign synthesis, selectivity, and structural characterization

Correction for ‘Aromatic sulfonate anion-induced pseudorotaxanes: environmentally benign synthesis, selectivity, and structural characterization’ by Han-Yuan Gong et al., Chem. Commun., 2015, DOI: 10.1039/c4cc08284b.

Aromatic sulfonate anion-induced pseudorotaxanes: environmentally benign synthesis, selectivity, and structural characterization

Aromatic sulfonates allow the effective construction of anion-containing pseudorotaxanes from a tetracationic macrocycle known as the “Texas box” in organic media and under organic-free aqueous conditions.