Bis(2,4-dimethyl­pyridinium) tetra­bromido­mercurate(II)

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

doi:10.1107/S1600536812046788

Volume 68
Part 12
Page m1499
December 2012

Received 6 November 2012
Accepted 13 November 2012
Online 17 November 2012

Key indicators
Single-crystal X-ray study
T = 293 K
Mean (C-C) = 0.014 Å
R = 0.050
wR = 0.102
Data-to-parameter ratio = 29.5
Details

Bis(2,4-dimethylpyridinium) tetrabromidomercurate(II)

Rawhi Al-Far,^a Salim F. Haddad ^b and Basem F. Ali ^c ^*

^aFaculty of Science and IT, Al-Balqa'a Applied University, Salt, Jordan,^bDepartment of Chemistry, The University of Jordan, Amman 11942, Jordan, and ^cDepartment of Chemistry, Al al-Bayt University, Mafraq 25113, Jordan
Correspondence e-mail: bfali@aabu.edu.jo

The asymmetric unit of the title compound, (C₇H₁₀N)₂[HgBr₄], consists of one cation and one half-anion, bisected by a twofold rotation axis passing through the metal atom. The anion exhibits a distorted tetrahedral arrangement about the Hg^II atom. In the crystal, the cations and anions are linked by N-HBr hydrogen-bonding interactions along [010]. Cation-cation [pi] - [pi] stacking and BrBr intermolecular interactions are absent.

Related literature

For intermolecular interactions, see: Desiraju (1997). For related structures, see: Al-Far & Ali (2007); Ali & Al-Far (2007); Ali et al. (2008). For structures containing the [HgBr₄]^2- anion, see: Gowda et al. (2009); Li et al. (2009). For standard bond lengths in the cation, see: Allen et al. (1987).

Experimental

Crystal data

(C₇H₁₀N)₂[HgBr₄]
M_r = 736.51
Monoclinic, C 2/c
a = 20.022 (5) Å
b = 7.7985 (9) Å
c = 17.651 (3) Å
= 129.12 (3)°
V = 2138.1 (11) Å³
Z = 4
Mo K radiation
= 14.67 mm^-1
T = 293 K
0.44 × 0.40 × 0.18 mm

Data collection

Agilent Xcalibur Eos diffractometer
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2011) T_min = 0.002, T_max = 0.072
5366 measured reflections
2895 independent reflections
1454 reflections with I > 2(I)
R_int = 0.036

Refinement

R[F² > 2(F²)] = 0.050
wR(F²) = 0.102
S = 1.01
2895 reflections
98 parameters
H-atom parameters constrained
_max = 1.45 e Å^-3
_min = -1.54 e Å^-3

Table 1
Selected bond lengths (Å)

Hg1-Br1	2.5767 (11)
Hg1-Br2	2.6160 (11)

Table 2
Hydrogen-bond geometry (Å, °)

D-HA	D-H	HA	DA	D-HA
N1-H1ABr2ⁱ	0.86	2.45	3.286 (7)	163
Symmetry code: (i) $[x, -y, z+{\script{1\over 2}}]$ .

Data collection: CrysAlis PRO (Agilent, 2011); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; 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: BX2429 ).

Acknowledgements

The structure was determined at the Hamdi Mango Center for Scientific Research at the University of Jordan, Amman, Jordan. RA-F would like to thank Al-Balqa'a Applied University (Jordan) for financial support (sabbatical leave).

References

Agilent (2011). CrysAlis PRO. Agilent Technologies, Yarnton, England.
Al-Far, R. & Ali, B. F. (2007). Acta Cryst. C63, m137-m139.
Ali, B. F. & Al-Far, R. (2007). Acta Cryst. C63, m451-m453.
Ali, B. F., Al-Far, R. H. & Haddad, S. F. (2008). Acta Cryst. E64, m751-m752.
Allen, F. H., Kennard, O., Watson, D. G., Brammer, L., Orpen, A. G. & Taylor, R. (1987). J. Chem. Soc. Perkin Trans. 2, pp. S1-19.
Desiraju, G. R. (1997). Chem. Commun. pp. 1475-1482.
Gowda, B. T., Foro, S., Terao, H. & Fuess, H. (2009). Acta Cryst. E65, m946.
Li, S.-J., Chen, A.-H., Zheng, Z.-Y., Liu, S.-W. & Liu, Q.-X. (2009). Acta Cryst. E65, m1652.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.

metal-organic compounds