2,2'-Bipyridinium bis(perchlorate)

The title compound, [H(2)bipy](ClO(4))(2) or C(10)H(10)N(2)(2+). 2ClO(4)(-), was obtained at the interface between an organic (2, 2'-bipyridine in methanol) and an aqueous phase (perchloric acid in water). The compound crystallizes in space group P-1 and comprises discrete diprotonated trans-bipyridinium cations, [H(2)bipy](2+), and ClO(4)(-) anions. The cations and anions are connected through N-H.O and C-H.O hydrogen bonds [distances N.O 2.817 (4) and 2.852 (4) A, and C.O 3.225 (6)-3.412 (5)A]. The C-C bond distance between the two rings is 1.452 (5) A. The bipyridinium cation has a trans conformation and the N-C-C-N torsion angle is 152.0 (3) degrees.