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Crystal and Molecular Structures of Four Salts from Isopropylamine, Cinnamic Acid, 2-Hydroxy-5-(phenyldiazenyl)benzoic Acid, m-Phthalic Acid and 2,6-Pyridinedicarboxylic Acid

Research paper by Shouwen Jin, Chao Feng, Xianhong Wen, Li Jin, Daqi Wang

Indexed on: 13 Feb '16Published on: 13 Feb '16Published in: 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 abstract 10.1007/s10870-016-0634-2.gif