Crystal and molecular structures of twelve salts from isopropylamine and different organic acids

• Twelve organic salts have been prepared and structurally characterized.
• The hydrogen bonds of the isopropylamine and organic acids have been ascertained.
• The NH⋯O hydrogen bonds are the primary forces in these salts.
• The secondary nonbonding interactions also play important role in structure propagation.

Twelve isopropylamine derived supramolecular complexes isopropylamine: (m-toluic acid) [(Hipa)+ ⋅ (mtua−), mtua− = m-toluate] (1), isopropylamine: (p-toluic acid) [(Hipa)+ ⋅ (ptua−), ptua− = p-toluate] (2), isopropylamine: (p-methoxybenzoic acid) [(Hipa)+ ⋅ (pmba−), pmba− = p-methoxybenzoate] (3), (isopropylamine): (3,4-methylenedioxybenzoic acid) [(Hipa)+ ⋅ (mba)−, mba = 3,4-methylenedioxybenzoate] (4), (isopropylamine): (2-methyl-2-phenoxypropanoic acid) [(Hipa)+ ⋅ (mpa−), mpa− = 2-methyl-2-phenoxypropionate] (5), (isopropylamine): (4-chlorophenoxyacetic acid) [(Hipa)+ ⋅ (cpa−), cpa− = 4-chlorophenoxyacetate] (6), (isopropylamine): (3,5-dinitrobenzoic acid) [(Hipa)+ ⋅ (dnba−), dnba− = 3,5-dinitrobenzoate] (7), (isopropylamine): (2-furoic acid) [(Hipa)+ ⋅ (fura−), fura− = 2-furoate] (8), (isopropylamine): (1-hydroxy-2-naphthoic acid) [(Hipa)+ ⋅ (hna), hna = 1-hydroxy-2-naphthoate] (9), (isopropylamine): (4-nitrophthalic acid) [(Hipa)2+ ⋅ (npa2−), npa2− = 4-nitrophthalate] (10), (isopropylamine)2: (2,5-bis-isopropylcarbamoyl-terephthalic acid): 2H2O [(Hipa)2+ ⋅ (bta2−) ⋅ 2H2O, bta2− = 2,5-bis-isopropylcarbamoyl-terephthalate] (11), and (isopropylamine)2: (1,5-naphthalenedisulfonic acid) [(Hipa)2+ ⋅ (nds2−), nds2− = 1,5-naphthalenedisulfonate] (12) were synthesized and structurally characterized by X-ray crystallography.All supramolecular architectures of 1–12 involve extensive classical hydrogen bonds as well as other non-covalent interactions. The results presented herein indicate that the strength and directionality of the NH⋯O, OH⋯O, and OH⋯S hydrogen bonds between the acidic components and isopropylamine are sufficient to bring about the formation of binary organic salts. The role of weak and strong non-covalent interactions in the crystal packing is ascertained. These weak interactions combined, the complexes 1–12 displayed 1D–3D framework structure.