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The syntheses and crystal structures of three hybrid perovskites, viz . poly[1-methyl-piperizine-1,4-diium [tri-μ-bromido-potassium] hemihydrate], {(C 5 H 14 N 2 )[KBr 3 ]·0.5H 2 O}  n  , (I), poly[1-methyl-piperizine-1,4-diium [tri-μ-bromido-rubidium] hemihydrate], {(C 5 H 14 N 2 )[RbBr 3 ]·0.5H 2 O}  n  , (II), and poly[1-methyl-piperizine-1,4-diium [tri-μ-bromido-caesium] hemihydrate], {(C 5 H 14 N 2 )[CsBr 3 ]·0.5H 2 O}  n  , (III), are described. These isostructural (space group Amm 2) phases contain a three-dimensional, corner-sharing network of distorted A Br 6 octa-hedra ( A = K, Rb, Cs) with the same topology as the classical perovskite structure. The doubly protonated C 5 H 14 N 2  2+ cations occupy inter-stices bounded by eight octa-hedra and the water mol-ecules lie in square sites bounded by four octa-hedra. N-H⋯Br, N-H⋯(Br,Br), N-H⋯O and O-H⋯Br hydrogen bonds consolidate the structures.

acta crystallographica. section e, crystallographic communications

Syntheses and crystal structures of a new family of hybrid perovskites: C5H14N2·ABr3·0.5H2O (A= K, Rb, Cs)