Hydrothermal synthesis and structures of the open-framework copper silicates Na_2[Cu_2Si_4O_(11)](H_2O)_2 (CuSH-2Na), Na_2[CuSi_3O_8] (CuSH-3Na), Cs_2Na_4[Cu_2Si_(12)O_(27)(OH)_2]{OH)_2 (CuSH-4NaCs), and Na_2[Cu_2Si_5O_(13)](H_2O)_3 (CuSH-6Na)

摘要

A series of open-framework copper silicates has been synthesized under mild hydrothermal conditions. The frameworks are based on double chains, single layers or double layers of SiO_4 tetrahedra interconnected by CuO_4 squares or tetrahedra or CuOs tetragonal pyramids. The structures contain 8-ring or 10-ring channel systems with apertures up to 2.7 X 5.9 A which are filled by alkali metal cations and water molecules.