Abstract
Two anhydrous salts of piperidine have been prepared with naphthalene-1,5-disulfonic acid, and 4-nitrophthalic acid by slow evaporation technique, and their structures were fully characterized. These two structures adopted homo or hetero supramolecular synthons. Compound 1 crystallizes in the triclinic, space group P-1, with a = 7.728(3) A, b = 8.042(3) A, c = 9.150(3) A, α = 80.631(4)°, β = 79.433(4)°, γ = 86.531(4)°, V = 551.3(3) A3, Z = 1. Compound 2 crystallizes in the monoclinic, space group P2(1)/c, with a = 6.3466(5) A, b = 24.008(2) A, c = 9.0390(7) A, α = 90°, β = 97.0050(10)°, γ = 90°, V = 1367.01(19) A3, Z = 4. Analysis of the crystal packing of 1, 2 suggests that there are N–H···O hydrogen bonds between the acids and the piperidine in both compounds. Except the classical hydrogen bonds, the secondary propagating interactions including CH2···O, O···Cπ, and CH2···π interactions also play important roles in structure extension. In conclusion, we have shown that 3D structures can be constructed by collective non-covalent interactions. The crystal structures of the salts from piperidine, naphthalene-1,5-disulfonic acid, and 4-nitrophthalic acid are predominantly stabilized by classical hydrogen bonds as well as CH2···O, O···Cπ, and CH2···π interactions.
Published Version
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