Dynamic structural reconstruction of (guanidinium+)2(benzene-1,4-disulfonate2−) host crystal by guest adsorption

摘要: Guanidinium (G+) and benzene-1,4-disulfonate (BDS2−) form a rigid electrostatic cation–anion crystal lattice, which undergoes an interesting dynamic structural reconstruction through guest adsorption–desorption processes with H2O, pyrrole (Pyrr), pyrazine (Pyz), thiophene (TP), pyridine (Py), 1,4-dioxane (Diox), or aniline (Ani). The host lattice of bis(guanidinium)benzene-1,4-disulfonate, (G+)2(BDS2−), does not contain void spaces initially, changed to host–guest crystals (G+)2(BDS2−)·(guest)x upon adsorption (x = 1, 2, 3). N–H+⋯−O3S– hydrogen bonds between the G+ cation BDS2− dianion formed tightly bound two-dimensional (2D) structures. These layers are connected by perpendicular dianions, forming crystalline pores. isotherm for Diox at 298 K indicated formation (G+)2(BDS2−)·(Diox)3, was consistent single-crystal X-ray analysis. Single (G+)2(BDS2−)·(Py–H2O)2 consist two hydrogen-bonded [(G+)2(BDS2−)]2 bilayers pores that accommodate 2 Py molecules. H2O molecules in lodged intralayer, leading [(G+)2(BDS2−)⋯(H2O)2⋯(G+)2(BDS2−)] bilayer. (G+)2(BDS2−) responded cycle reconstruction. A polar Ani into symmetry from centric P acentric P21 (G+)2(BDS2−)·(Ani)3.