Abstract
Abstract Three new layered copper hydrogen selenite nitrates, ( A NO 3 )[Cu(HSeO 3 ) 2 ] ( A = Cs, and Tl), and (RbNO 3 ) 2 [Cu(HSeO 3 ) 2 ] have been prepared via isothermal evaporation of concentrated nitric acid solutions. The Tl and Cs compounds adopt a motif related to previously known (NH 4 Cl)[Cu(HSeO 3 ) 2 ]; the structure of the Rb compound represents a new structure type. The structures of ( A NO 3 )[Cu(HSeO 3 ) 2 ] ( A = Cs, Tl), (RbNO 3 ) 2 [Cu(HSeO 3 ) 2 ], and (NH 4 NO 3 ) 3 [Cu(HSeO 3 ) 2 ] form a unique homological series distantly related to Ruddlesden – Popper series of layered perovskites.