Experimental, quantum chemical studies and Hirshfeld surface analysis on molecular structure of two picrate salts: 1, 4-diaza bicyclo [2,22] octane and Furan-2yl methanamine

Robustness of hydrogen bonding in the construction of supramolecular architectures in protonated perchlorate salts

Five new multicomponent salts of perchloric acid with a series of substituted anilines and N-heterocyclic amines namely Diphenylaminium perchlorate (DPAPC) (1), 2, 5-dichloroanilinium perchlorate (25DAP) hydrate (2), 4-Methylanilinium perchlorate (4MAPC) (3), 4-diamino-6-methyl-1, 3, 5-triazin-1-ium hydrogen perchlorate (24DAMTHP) (4), and 8-hydroxyquinolinium hydrogen perchlorate (8HQP) (5) were prepared and structurally characterized. The entire complexes were subjected to FTIR and elemental analysis. A vast family of intermolecular contacts N-H…O, O-H…O, N-H…N, and C-H…O was observed, which are key ingredient in the generation of privileged supramolecular self-assemblies appeared as one-dimensional chain, two-dimensional ladder, and helix. Cambridge Structural Database (CSD) analysis of 52 hits revealed the perchloric acid display higher propensity of ladder architectures. Molecular stability of the complexes was studied by quantum chemical calculations using DFT/B3LYP method with 6-31G(d,p) basis set. Furthermore, their relative charge distributions were identified using molecular electrostatic potential map. The use of Hirshfeld surfaces in combination with fingerprint plots was visualized in order to study the closer contacts within the molecule. The relative contribution of the whole percentage of interactions associated is highlighted.