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.