Precise design and preparation of two 3D organic-inorganic perovskite ferroelectrics (1,5-diazabicyclo[3.2.2]nonane)RbX (X = Br, I)

Compared with the spherical molecule 1,4-diazoniabicyclo[2.2.2]-octane (2.2.2-dabco), 1,5-diazabicyclo[3.2.2]nonane (3.2.2-dabcn) bears a lower symmetry and larger size. As expected, reactions of 3.2.2-dabcn with rubidium halides gave two 3D molecular ferroelectrics [3.2.2-H 2 dabcn]RbX 3 (X = Br for 1 ; X = I for 2 ) with T c at 342 K ( 1 ) and 293 K ( 2 ). Two 3D organic-inorganic hybrid perovskite ferroelectrics [3.2.2-dabcn]RbX 3 (X = Br for 1 ; X = I for 2 ) with Curie temperatures at 342 K and 293 K were designed and prepared by reaction of 1,5-diazabicyclo[3.2.2]nonane with RbX.