Crystal structure and supramolecular architecture of antiallergic diphenylene diethyl dioxalamates

The crystal structure and the supramolecular architectures of the antiallergic compounds N,N^′-(4,4^′-methanediyl-di-phenyl)-bis-diethyl dioxalamate (1); N^′,N^′-(4,4^′-oxydi-p-phenylene)-bis-diethyl dioxalamate (2); N,N^′-(4,4^′-biphenylene)-bis-diethyl dioxalamate (3) are reported. The supramolecular self-assembly in 1-3 is driven by N-H···O=C hydrogen bonds and reinforced by C-H···O=C, C-H···π and C=O···C=O interactions. The three compounds preferred to form cross-linked supramolecular architectures. Intermolecular interactions also were studied by the Hirshfeld surface analysis, revealing that the H···H, O···H, and C···H are the more dominant contacts in the three compounds. The knowledge of crystal structure will allow us to perform theoretical studies to evaluate the antiallergic activity of compounds 1-3.