Received 28 June 2011
In the cation of the title salt, C12H14N3O+·C24H20B-, the dihedral angle between the quinoline ring and the mean plane of the urea fragment is 61.51 (5)°. In the crystal, the cations interact through weak C-HO hydrogen bonding, forming a zigzag chain along the c-axis direction; the cations and anions are involved in weak intermolecular C-H and N-H interactions as donors and acceptors, respectively.
For applications of ionic liquids, see: Zhao & Malhotra (2002); Chauvin & Olivier-Bourbigou (1995); Seddon (2001); Hapiot & Lagros (2008); Blaster & Studer (2003). For a related structure, see: Youngme et al. (2006).
Data collection: CrystalClear (Rigaku, 2005); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: XU5255 ).
We acknowledge the National Natural Science Foundation of China (grant Nos. 20873041 and 21072061) and the Shanghai Leading Academic Discipline Project (grant No. B409) for financial support.
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