Two three-dimensional pillar-layer AgI-frameworks with helical arrays containing hexamine

Two three-dimensional pillar-layer AgI-frameworks with helical arrays have been synthesized under room temperature. Compound I, {[Ag2 (H2O) (L2)2L1].H2O}n（L1 = hexamethylenetetramine, H1L2 = 3-Pyridinesulfonic acid), is constructed from two-dimensional (6,3) layers which are braced by helical arrays; Compound II, {[Ag3(L1)2(L3)].6H2O}n (H3L3 = citric acid), is created by two-dimensional layers which are made up of the mix-helical arrays and further pillared by L3 anions and Ag ions. Compound I and compound II have been characterized by single-crystal X-ray structure determination, powder X-ray diffraction, IR and TGA. Also, the water and methanol adsorption isotherms for Compound II have been studied.

A three-dimensional AgI-framework, {[Ag2 (H2O) (L2)2L1].H2O}n (Compound I)（L1 = hexamethylenetetramine, HL2 = 3-Pyridinesulfonic acid）with a (3, 5)-connected topology in which the two-dimensional (6,3) layer is braced by the right-handed helices (P) and left-handed ones (M), has been synthesized by the conventional evaporation method while compound II, {[Ag3(L1)2(L3)].6H2O}n (H3L3 = citric acid), with a (3, 4)-connected topology, is constructed from a 2D (6, 3) layer which is made up of mix-helical arrays and further pillared by the L3 ligands and Ag ions.Figure optionsDownload as PowerPoint slideResearch Highlights
► Helical structures are found in the three-dimension AgI-framework.
► Two types of 3D pillar-layer with helical structures are constructed.
► Boat conformation (H2O)6 clusters accommodate in the three-dimension framework.