Preparation of Multiple Cocrystals of Trithiocyanuric Acid with Some N‑Donor Compounds

Varied multicomponent molecular assemblies of trithiocyanuric acid (TCA) with N-donor compounds are prepared by varying the reaction conditions. The rational structural features, from a basic molecular recognition pattern to three-dimensional molecular assemblies, of the obtained molecular complexes are explained in detail with the help of single crystal X-ray diffraction analysis. The structural analysis highlights, within the cocrystals, TCA with multiple hydrogen bonding groups are capable of forming variable molecular patterns on its own results in varied molecular assemblies for the individual molecular ensembles with 4,4′-bipyridine (<b>bpy</b>), 1,2-bis-(4-pyridyl)­ethylene (<b>bpyea</b>), and 1,7-phenanthroline (<b>phen</b>)

Gelation and Structural Transformation Study of Some 1,3,5-Benzenetricarboxamide Derivatives

Short-chain analogues of <i>N</i>,<i>N</i>′,<i>N</i>″-tris-(4-alkyl­phenyl)-1,3,5-benzenetricarboxamide derivatives (methyl to butyl) are prepared, and their gelation study renders a positive result for all, except the butyl derivative, in both DMSO and DMSO/H₂O. The crystal structure analysis of the parent compound (<b>1a</b>) and its methyl (<b>1b</b>) and butyl (<b>1e</b>) derivatives shows columnar structures. However, a notable difference has been observed within the columnar structures of <b>1a</b> or <b>1b</b> and <b>1e</b>. Detailed structural analysis was carried out to reason such varied molecular assemblies, based on the deviation angle of amide groups, along with the aid of some reported examples that reveal the structural transformation of 1,3,5-benzenetricarboxamide derivatives from sheets to different columnar structures. In addition, similarity in the simulated powder pattern of the DMSO adducts of <b>1a</b> and <b>1b</b> and the experimental powder pattern of the xerogels of <b>1a</b> and <b>1b</b> indicates the possibility of similar packing in both crystals and the fibers of the gel

Designer Host–Guest Complexes: Co-Crystals of 1,3-Adamantanedicarboxylic Acid and 4,7-Phenanthroline with Some Guests

Multicomponent host–guest complexes consisting of 1,3-adamantanedicarboxylic acid (<b>1</b>) and 4,7-phenanthroline (phen) as the host moiety with different guests are prepared through co-crystallization. Detailed structural analysis of the obtained complexes, characterized by the single-crystal X-ray diffraction method, has been reported. In all the complexes, molecules of <b>1</b> and phen constitute a unique four-membered cyclic host network into a two-dimensional arrangement. Further stacking of such networks resulted in a channel structure directed by the guest species through O–H···O hydrogen bonds