Shouwen Jin, C. Feng, Xianhong Wen
Feb 13, 2016
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Journal
Journal of Chemical Crystallography
Abstract
Four isopropylamine derived supramolecular salts were synthesized and characterized by X-ray crystallography, IR, mp, and elemental analysis. Compound 1 crystallizes in the monoclinic, space group P2(1), with a = 7.1957(6) Å, b = 6.4365(5) Å, c = 13.3816(11) Å, α = 90°, β = 92.7390(10)°, γ = 90°, V = 619.06(9) Å3, Z = 2. Compound 2 crystallizes in the monoclinic, space group P2(1)/n, with a = 9.2739(8) Å, b = 4.8837(3) Å, c = 35.222(3) Å, α = 90°, β = 92.9800(10)°, γ = 90°, V = 1593.1(2) Å3, Z = 4. Compound 3 crystallizes in the orthorhombic, space group Pnma, with a = 13.1220(11) Å, b = 19.9560(16) Å, c = 6.3290(5) Å, α = 90°, β = 90°, γ = 90°, V = 1657.3(2) Å3, Z = 4. Compound 4 crystallizes in the monoclinic, space group P2(1)/c, with a = 7.0436(5) Å, b = 17.2844(13) Å, c = 13.0970(11) Å, α = 90°, β = 97.2680(10)°, γ = 90°, V = 1581.7(2) Å3, Z = 4. All supramolecular salts bear intermolecular N–H···O hydrogen bonds. Further analysis of the crystal packing of 1–4 suggests that the CH3–O and CH3–Cπ interactions also have equal importance in the structure extension as the classical hydrogen bonds. In conclusion, the discrete ions can be architectured into 1D–3D structures by the collective non-covalent interactions.Graphical AbstractThe crystal structures of the salts from isopropylamine, cinnamic acid, 2-hydroxy-5-(phenyldiazenyl)benzoic acid, m-phthalic acid, and 2,6-pyridinedicarboxylic acid are predominantly stabilized by the classical hydrogen bonds as well as CH3–O, and CH3–Cπ interactions, leading to 1D–3D structures.