Received 2 July 2013
In the title methylene-bridged di(tetrahydropyrimidinium) salt, C33H50N42+·2Br-·C2H5OH·H2O, the two tetrahydropyrimidinium rings have envelope conformations with the central CH2 C atom as the flap. Their mean planes are inclined to one another by 73.31 (13)° and the attached benzene rings are inclined to one another by 67.39 (15)°. The methylene-C-N bond lengths in the tetrahydropyrimidinium rings are 1.314 (3) and 1.304 (3) Å, values typical for C=N double bonds. The distances between the methylene-bridge C atom and the linked tetrahydropyrimidinium N atom are 1.457 (3) and 1.465 (3) Å, values typical for C-N single bonds. The molecules co-crystallized with H2O and EtOH molecules from the solvent. In the crystal, there is a zigzag chain along  of water molecules linked by one of the Br- anions via O-HBr hydrogen bonds. The second Br- anion is hydrogen bonded (O-HBr) to the ethanol solvent molecule. There are also a number of C-HBr and C-HO hydrogen bonds present, leading to the formation of a two-dimensional network lying parallel to the bc plane.
For the synthesis of the precursor bis(3-(2,6-diisopropyl-phenyl)-hexahydropyrimidinyl)methane, see: Bisceglia et al. (2004). For metal complexes of substituted 1,4,5,6-tetrahydropyrimidines, see: Mao et al. (2012).
Data collection: CrysAlis PRO (Agilent, 2011); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SU2619 ).
The authors thank Ms Y. Zhu for technical assistance. This research was supported by the National Nature Science Foundation of P. R. China (No. 21172055) and the High-Level Talents Foundation of Henan University of Technology.
Agilent (2011). CrysAlis PRO. Agilent Technologies UK Ltd, Yarnton, England.
Bisceglia, J. Á., García, M. B., Massa, R., Magri, M. L., Zani, M., Gutkind, G. O. & Orelli, L. R. (2004). J. Heterocycl. Chem. 41, 85-90.
Dolomanov, O. V., Bourhis, L. J., Gildea, R. J., Howard, J. A. K. & Puschmann, H. (2009). J. Appl. Cryst. 42, 339-341.
Mao, P., Yang, L., Xiao, Y., Yuan, J. & Song, M. (2012). J. Organomet. Chem. 705, 39-43.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.