Acta Cryst. (2007). E63, m1569  [ doi:10.1107/S1600536807021186 ]

A lead-halide ladder complex: catena-poly[bis(2,3-dimethylquinoxalinium) [[di-₂-bromido-bis[dibromoplumbate(II)]]-di-₂-bromido]]

B. F. Ali, R. Al-Far and S. Haddad

Abstract: In the title compound, {(C₁₀H₁₂N₂)₂[Pb₂Br₈]}_n, the asymmetric unit consists of half a cation and one-quarter of a doubly-bridged dinuclear anionic unit. The planar cations lies on a twofold axis that runs lengthwise through both rings. The Pb and one Br atoms are located on twofold axes, whereas the second Br atom is located on a mirror plane and the third lies on a general position. The polymeric anion forms an infinite ladder structure running along the c axis with rungs consisting of Pb and bridging Br atoms, with two octahedra sharing edges as the rungs of the ladder and sharing vertices as the rails. There are N-HBr hydrogen-bonding interactions, ca 3.21 Å, linking the PbBr ladders to the cations.

Online 3 May 2007

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