Acta Cryst. (2008). E64, o434  [ doi:10.1107/S1600536807067086 ]

1-[Bicyclo[4.2.0]octa-1(6),2,4-trien-3-yl]-3-[bicyclo[4.2.0]octa-1(6),2,4-trien-3-ylmethyl]imidazolium hexafluorophosphate

F.-H. Zhu, J.-X. Yang, Z.-H. Mao and R.-G. Xie

Abstract: In the title compound, C₂₀H₁₉N₂⁺·PF₆^-, the two benzocyclobutene units are essentially planar and they form dihedral angles of 38.0 (2) and 72.7 (2)°, with the central imidazolium ring. In the crystal structure, weak C-H and -- stacking interactions [centroid-centroid distance = 3.742 (2) Å] contribute to the stability of the crystal structure. The PF₆^- ion is disordered over two positions with site occupancies of 0.869 (9) and 0.131 (9).

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