2,5-Bis(pyridinium-2-yl)-3,6-bis­(2-pyrid­yl)pyrazine bis­[tetra­chlorido­aurate(III)]

Abedi, A.; Dabbaghi, A.; Amani, V.

doi:10.1107/S1600536811036208

Volume 67
Part 10
Pages m1375-m1376
October 2011

Received 20 August 2011
Accepted 5 September 2011
Online 14 September 2011

Key indicators
Single-crystal X-ray study
T = 100 K
Mean (C-C) = 0.004 Å
R = 0.019
wR = 0.050
Data-to-parameter ratio = 20.7
Details

2,5-Bis(pyridinium-2-yl)-3,6-bis(2-pyridyl)pyrazine bis[tetrachloridoaurate(III)]

Anita Abedi,^a ^* Azra Dabbaghi ^a and Vahid Amani ^b

^aDepartment of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran, and ^bDepartment of Chemistry, Share-Ray Branch, Islamic Azad University, Tehran, Iran
Correspondence e-mail: anita_abedi@yahoo.com

In the title compound, (C₂₄H₁₈N₆)[AuCl₄]₂, the cation is located on an inversion center. Each of the two independent Au^III ions lies on an inversion center and has a distorted square-planar geometry. In the crystal, intermolecular C-HCl hydrogen bonds, [pi] - [pi] interactions [centroid-centroid distances = 3.5548 (16) and 3.7507 (16) Å] and Au [pi] interactions [Aucentroid distance = 3.6424 (10) Å] are effective in the stabilization of the structure, resulting in the formation of a supramolecular structure. Intramolecular N-HN hydrogen bonds are present in the cation.

Related literature

For the structures of related proton-transfer complexes, see: Abedi et al. (2008); Aragoni et al. (2005a,b); Bock et al. (1992); Calleja et al. (2001); Graf & Stoeckli-Evans (1996); Hasan et al. (1999); Hojjat Kashani et al. (2008); Johnson & Steed (1998); Kalateh et al. (2008); Padgett et al. (2005); Yap et al. (1995); Yildirim et al. (2009a,b); Zhang et al. (2006).

Experimental

Crystal data

(C₂₄H₁₈N₆)[AuCl₄]₂
M_r = 1067.98
Triclinic, $[P \overline 1]$
a = 7.2847 (6) Å
b = 9.6611 (8) Å
c = 10.6263 (9) Å
= 79.6692 (13)°
= 78.7378 (12)°
= 88.8600 (13)°
V = 721.48 (10) Å³
Z = 1
Mo K radiation
= 10.93 mm^-1
T = 100 K
0.30 × 0.20 × 0.20 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T_min = 0.080, T_max = 0.110
8652 measured reflections
3821 independent reflections
3395 reflections with I > 2(I)
R_int = 0.020

Refinement

R[F² > 2(F²)] = 0.019
wR(F²) = 0.050
S = 1.05
3821 reflections
185 parameters
H-atom parameters constrained
_max = 1.76 e Å^-3
_min = -1.36 e Å^-3

Table 1
Selected bond lengths (Å)

Au1-Cl1	2.2775 (7)
Au1-Cl2	2.2774 (6)
Au2-Cl3	2.2834 (7)
Au2-Cl4	2.2821 (6)

Table 2
Hydrogen-bond geometry (Å, °)

D-HA	D-H	HA	DA	D-HA
N2-H2NN3ⁱ	0.87	1.69	2.538 (3)	164
C4-H4ACl1ⁱⁱ	0.95	2.77	3.680 (3)	161
C6-H6ACl2ⁱⁱⁱ	0.95	2.77	3.519 (3)	136
Symmetry codes: (i) -x+1, -y+1, -z+1; (ii) -x+1, -y+1, -z; (iii) x, y-1, z+1.

Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXTL.

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HY2466 ).

Acknowledgements

We thank the Graduate Study Councils of the Islamic Azad University, North Tehran Branch, for financial support.

References

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metal-organic compounds