Two intricate hydrogen-bonded networks formed by m-sulfophenylphosphonic acid, melamine, and water molecules

Multicomponent Supramolecular Assemblies of Melamine and α-Hydroxycarboxylic Acids: Understanding the Hydrogen Bonding Patterns and Their Physicochemical Consequences

“…The packing is defined by planar chains of melaminium cations arranged parallel to the [010] direction, with a double amine-pyridyl synthon of ring motif R 2 2 (8) between the neighboring inverted Hme + units (Figure ). The motif for the hydrogen-bonded assembly of two melaminium cations is observed in many other melamine or melaminium structures, as reported previously. , A Hme + cation can create two cyclic H-bonding motifs, described by the R 2 2 (8) graph set, that are utilized for H-bonding between the neighboring Hme + cations. Additionally, the different molecular chains are connected via glycolate ions with typical hydrogen bond motifs between anion and cation hydrogen atoms such as R 1 2 (5) or R 2 1 (6).…”

“…Those chains contain both me and Hme + residues which alternate within the chain, which is running in the [100] direction (Figure a). Such ribbons are frequently observed in cocrystals of melamine . The me molecules and Hme + cations form N–H···O bonds with the carboxylate groups of H 2 ma with R 2 2 (8) and R 2 1 (6) structural motifs.…”

<span><strong>Preparation and Structural Assessment of Cocrystal Solvates and Cocrystal Salts of 1,3,5-Triazine-2,4,6-triamine with alpha-Hydroxycarboxylic Acids</strong></span>

“…3a). Such ribbons are frequently observed in cocrystals of melamine [8]. The me molecules and Hme + cations form N-H···O bonds with the carboxylate groups of H2ma with 2 2 (8) and 2 1 (6) structural motifs.…”

“…4a). Thus, an O4-involved 2 2 (8) ring motif can be identified. − ]2 dimers leads to a larger-scale one-dimensional chains which extends along the ac-plane to give 2D layers (Fig.…”