catena-Poly[[diiodidomercury(II)]-μ2-2-amino­pyrazine-κ2N1:N4]

Shirvan, S.A.; Asghariganjeh, M.R.; Aghajeri, M.; Haydari Dezfuli, S.; Hossini, F.

doi:10.1107/S1600536812006149

Volume 68
Part 3
Page m303
March 2012

Received 7 February 2012
Accepted 12 February 2012
Online 17 February 2012

Key indicators
Single-crystal X-ray study
T = 298 K
Mean (C-C) = 0.020 Å
Disorder in main residue
R = 0.083
wR = 0.224
Data-to-parameter ratio = 17.9
Details

catena-Poly[[diiodidomercury(II)]-₂-2-aminopyrazine-²N¹:N⁴]

Sadif A. Shirvan,^a ^* Mohammad R. Asghariganjeh,^a Manouchehr Aghajeri,^a Sara Haydari Dezfuli ^a and Farzaneh Hossini ^b

^aDepartment of Chemistry, Omidieh Branch, Islamic Azad University, Omidieh, Iran, and ^bDepartment of Chemistry, Mahshahr Branch, Islamic Azad University, Mahshar, Iran
Correspondence e-mail: sadif_shirvan1@yahoo.com

In the crystal of the title polymeric compound, [HgI₂(C₄H₅N₃)]_n, the Hg^II cation is located on a twofold rotation axis and is coordinated by two I^- anions and two 2-aminopyrazine ligands in a distorted HgI₂N₂ tetrahedral geometry. In the crystal, the 2-aminopyrazine ligand is equally disordered over two positions about an inversion center, and bridges the Hg^II cations with pyrazine N atoms to form a polymeric chain running along the c axis. In the polymeric chain, the amino groups link to the coordinated I^- anions via intermolecular N-HI hydrogen bonds.

Related literature

For related structures, see: Sun et al. (2009); Pagola et al. (2008); Boonmak et al. (2010); Gao & Ng (2011); Goher et al. (2008).

Experimental

Crystal data

[HgI₂(C₄H₅N₃)]
M_r = 549.50
Monoclinic, C 2/c
a = 15.3389 (19) Å
b = 6.8791 (8) Å
c = 9.6239 (11) Å
= 103.828 (10)°
V = 986.1 (2) Å³
Z = 4
Mo K radiation
= 21.81 mm^-1
T = 298 K
0.50 × 0.05 × 0.04 mm

Data collection

Bruker APEXII CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2001) T_min = 0.275, T_max = 0.417
2648 measured reflections
933 independent reflections
911 reflections with I > 2(I)
R_int = 0.173

Refinement

R[F² > 2(F²)] = 0.083
wR(F²) = 0.224
S = 1.08
933 reflections
52 parameters
H-atom parameters constrained
_max = 2.67 e Å^-3
_min = -2.69 e Å^-3

Table 1
Selected bond lengths (Å)

Hg1-I1	2.6373 (13)
Hg1-N1ⁱ	2.497 (11)
Symmetry code: (i) $[-x, y, -z+{\script{3\over 2}}]$ .

Table 2
Hydrogen-bond geometry (Å, °)

D-HA	D-H	HA	DA	D-HA
N2-H2AI1ⁱ	0.86	2.83	3.67 (3)	169
Symmetry code: (i) $[-x, y, -z+{\script{3\over 2}}]$ .

Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: XU5467 ).

Acknowledgements

We are grateful to the Islamic Azad University, Omidieh Branch, for financial support.

References

Boonmak, J., Nakano, M., Chaichit, N., Pakawatchai, C. & Youngme, S. (2010). Dalton Trans. 39, 8161-8167.
Bruker (2001). SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.
Bruker (2007). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.
Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565.
Farrugia, L. J. (1999). J. Appl. Cryst. 32, 837-838.
Gao, S. & Ng, S. W. (2011). Acta Cryst. E67, m1049-m1050.
Goher, M. A. S., Mautner, F. A., Sodin, B. & Bitschnau, B. (2008). J. Mol. Struct. 879, 96-101.
Pagola, S., Pike, R. D., deKrafft, K. & Tronic, T. A. (2008). Acta Cryst. C64, m134-m136.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Sun, D., Luo, G.-G., Zhang, N., Huang, R.-B. & Zheng, L.-S. (2009). Acta Cryst. C65, m478-m480.