Similar hydrogen-bonded ribbons in three 4,4’-sulfonyldibenzoic anion/boric acid and tetrabutylammonium inclusion compounds

Abstract

Three novel inclusion compounds of 4,4’-sulfonyldibenzoic anion, boric acid and tetrabutylammonium, 2[(C4H9)4N]+·[C14O6H8S]2−·3.5[B(OH)3]·1.5H2O (1), 2[(C4H9)4N]+·[C14O6H8S]2−·2[B(OH)3]·7H2O (2) and 1.5[(C4H9)4N]+·0.5[C14O6H9S]2−·0.5[C14O6H9S]−·2[B(OH)3] (3), were prepared and characterized by single crystal X-ray diffraction, IR spectroscopy and thermogravimetric analyses (TGA). Compound 1: triclinic system, P¯ 1, a = 9.371(3) Å, b = 17.624(5) Å, c = 18.678(6) Å, α = 92.471(3)°, β = 101.837(4)°, γ = 91.331(4)°, V = 3014.9(15) Å3, Z = 2, R1 = 0.0902; compound 2: orthorhombic, Pca21, a = 19.8104 Å, b = 9.2340 Å, c = 34.9875 Å, V = 6400.2(18) Å3, Z = 4, R1 = 0.0728; compound 3: triclinic, P¯ 1, a = 10.0088(1) Å, b = 13.2179(1) Å, c = 18.945(2) Å, α = 70.6850(1)°, β = 86.9100(1)°, γ = 71.3400(1)°, V = 2237.2(4) Å3, Z = 2, R1 = 0.0628. The results show that the host 4, 4’-sulfonyldibenzoic anion can combine with boric acid to form the similar hydrogen-bonded ribbons through O-H…O interactions in these three compounds. However, with the existence of the same guest template of tetrabutylammonium, the similar ribbons finally generate two sandwich-like layer frameworks of 1 and 2, and one 3D network containing cavities of 3. Clearly, the participation of water molecules should be mainly responsible for the distinct difference between the layer structure and the 3D network.