Abstract
The crystal structures of the title compounds consist of 1,4-dimethyl-1,4-diazabicyclo[2.2.2]octane-1,4-diium cation [C8H18N2]2+ and [H2PO4]− or [HSO4]− anions. Both crystal structures are monoclinic, the structure of the dihydrogen phosphate (I) is non-centrosymmetric (P21) with a = 6.4090(2) Å, b = 13.6920(5) Å, c = 7.6140(3) Å, β = 94.620(2)°, V = 665.97(4) Å3, Z = 2; whereas the unit cell of the hydrogen sulphate (II) is centrosymmetric (P21/c) with a = 13.8460(2) Å, b = 12.6610(2) Å, c = 8.0360(2) Å, β = 99.5800(12)°, V = 1389.10(5) Å3, Z = 4. Both the structures are formed by the different bonding patterns of the anions interlinked by strong and moderate O–H···O hydrogen bonds. While the structure of (I) consists of a two-dimensional network of the hydrogen bonded dihydrogen phosphates, the infinite chains of the hydrogen bonded hydrogen sulphates are the basic building unit of the structure (II). In addition to the dominant electrostatic interaction the divalent cations stabilize themselves in the structures by forming several C–H···O hydrogen bonds to the oxygen atoms of the anions. The IR spectra of both the compounds are strongly affected by the hydrogen bonds whose influence on OH stretching vibrations is analysed by means of the DFT calculations in the solid state.
Graphical Abstract
The crystal structures of the 1,4-dimethyl-1,4-diazabicyclo[2.2.2]octane-1,4-diium dihydrogen phosphate and hydrogen sulphate comprise strong and moderate O–H···O hydrogen bonds significantly influencing the high energy region of IR spectra.
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Acknowledgments
Financial support by the Charles University in Prague, through the project GAUK 133508 and by the Long term research plan of the Ministry of Education of the Czech Republic through the project No. MSM 0021620857 is acknowledged. The work was partially supported by the Slovak Grant Agency VEGA under the contract No. 2/0150/09.
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Kaman, O., Smrčok, Ľ., Císařová, I. et al. Dihydrogen Phosphate and Hydrogen Sulphate of 1,4-Dimethyl-1,4-diazabicyclo[2.2.2]octane-1,4-diium: Crystal Structures, Hydrogen Bonding and Infrared Spectra. J Chem Crystallogr 41, 1539–1546 (2011). https://doi.org/10.1007/s10870-011-0137-0
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DOI: https://doi.org/10.1007/s10870-011-0137-0