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The title compound, C 10 H 22 N 2   2+ ·2Br − , was synthesized  via  reduction of 2,2′-dipyridyl with Ni–Al alloy/KOH, followed by separation of diastereoisomers ( meso  and  rac ) by recrystallization from ethanol. Although the two bridging C atoms are optically active, these two chiral centers adopt an ( S , R ) configuration; thus, the title compound contains an achiral  meso  form of 2,2′-bi­piperidine. Both of the piperidinium rings adopt chair conformations, and the two N atoms are  trans  to each other; an inversion center is located in the mid-point of the central C—C bond. The conformation of the organic moiety resembles that of 1,1′-bi(cyclo­hexa­ne). The organic di­ammonium cations are linked to each other through hydrogen bonding with bromide counter-ions, each of which forms two hydrogen bonds (N—H⋯Br) with two adjacent organic cations, thus linking the latter together in sheets parallel to (100).

(2R,2′S)-2,2′-Bipiperidine-1,1′-diium dibromide