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Volume 68 
Part 11 
Page m1434  
November 2012  

Received 5 October 2012
Accepted 25 October 2012
Online 31 October 2012

Key indicators
Single-crystal X-ray study
T = 100 K
Mean [sigma](C-C) = 0.006 Å
R = 0.061
wR = 0.160
Data-to-parameter ratio = 18.0
Details
Open access

Pyridinium cis-diaquabis(oxalato-[kappa]2O,O')chromate(III)

aDepartment of Inorganic Chemistry, University of Yaounde I, POB 812 Yaounde, Cameroon,bHigher Teacher Training College, POB 47, University of Yaounde 1, Cameroon, and cInstitut für Anorganische Chemie, RWTH Aachen, D-52056 Aachen, Germany
Correspondence e-mail: jnenwa@yahoo.fr

The title compound, (C5H6N)[Cr(C2O4)2(H2O)2], contains one protonated pyridine molecule and one [Cr(C2O4)2(H2O)2]- complex anion in the asymmetric unit. The CrIII in the complex anion is coordinated in a distorted octahedral environment by two O atoms from two cis water molecules and four O atoms from two chelating oxalate dianions. The crystal packing is stabilized by intermolecular N-H...O(oxalate) and O-H...O(oxalate) hydrogen bonds and by [pi]-[pi] stacking interactions (centroid-centroid distance = 3.602 Å) between pyridine rings, thereby building up a three-dimensional network.

Related literature

For the structural characterization of organic-inorganic salts containing the [Cr(C2O4)2(H2O)2]- anion, see: Bélombé et al. (2009[Bélombé, M. M., Nenwa, J. & Emmerling, F. (2009). Z. Kristallogr. New Cryst. Struct. 224, 239-240.]); Nenwa et al. (2010[Nenwa, J., Belombe, M. M., Ngoune, J. & Fokwa, B. P. T. (2010). Acta Cryst. E66, m1410.], 2012[Nenwa, J., Bebga, G., Martin, S., Bélombé, M. M., Mbarki, M. & Fokwa, B. P. T. (2012). Acta Cryst. E68, m1325-m1326.]); Chérif et al. (2011[Chérif, I., Abdelhak, J., Zid, M. F. & Driss, A. (2011). Acta Cryst. E67, m1648-m1649.]); Chérif, Abdelhak et al. (2012[Chérif, I., Abdelhak, J., Zid, M. F. & Driss, A. (2012). Acta Cryst. E68, m824-m825.]); Chérif, Zid et al. (2012[Chérif, I., Zid, M. F., El-Ghozzi, M. & Avignant, D. (2012). Acta Cryst. E68, m900- m901.]).

[Scheme 1]

Experimental

Crystal data
  • (C5H6N)[Cr(C2O4)2(H2O)2]

  • Mr = 344.18

  • Monoclinic, P 21 /c

  • a = 7.479 (2) Å

  • b = 24.700 (8) Å

  • c = 7.056 (2) Å

  • [beta] = 107.744 (6)°

  • V = 1241.4 (6) Å3

  • Z = 4

  • Mo K[alpha] radiation

  • [mu] = 0.98 mm-1

  • T = 100 K

  • 0.15 × 0.04 × 0.04 mm

Data collection
  • Bruker SMART APEX CCD diffractometer

  • Absorption correction: multi-scan (SADABS; Bruker, 2004[Bruker (2004). SMART, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]) Tmin = 0.862, Tmax = 0.961

  • 18649 measured reflections

  • 3703 independent reflections

  • 2580 reflections with I > 2[sigma](I)

  • Rint = 0.106

Refinement
  • R[F2 > 2[sigma](F2)] = 0.061

  • wR(F2) = 0.160

  • S = 1.13

  • 3703 reflections

  • 206 parameters

  • 5 restraints

  • H atoms treated by a mixture of independent and constrained refinement

  • [Delta][rho]max = 0.59 e Å-3

  • [Delta][rho]min = -0.69 e Å-3

Table 1
Hydrogen-bond geometry (Å, °)

D-H...A D-H H...A D...A D-H...A
N1-H1...O24 0.86 2.10 2.783 (4) 136
N1-H1...O23 0.86 2.17 2.901 (4) 143
OW1-H1B...O12i 0.81 (2) 1.94 (2) 2.720 (4) 162 (5)
OW1-H1A...O23ii 0.86 (5) 1.84 (5) 2.680 (4) 168 (5)
OW2-H2A...O13iii 0.81 (2) 1.98 (3) 2.732 (4) 154 (4)
OW2-H2B...O14iv 0.82 (2) 1.83 (2) 2.639 (4) 173 (5)
Symmetry codes: (i) [x, -y+{\script{3\over 2}}, z+{\script{1\over 2}}]; (ii) x, y, z+1; (iii) [x+1, -y+{\script{3\over 2}}, z+{\script{1\over 2}}]; (iv) x+1, y, z.

Data collection: SMART (Bruker, 2004[Bruker (2004). SMART, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]); cell refinement: SAINT (Bruker, 2004[Bruker (2004). SMART, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); molecular graphics: DIAMOND (Brandenburg, 2010[Brandenburg, K. (2010). DIAMOND. Crystal Impact GbR, Bonn, Germany.]); software used to prepare material for publication: WinGX (Farrugia, 1999[Farrugia, L. J. (1999). J. Appl. Cryst. 32, 837-838.]).


Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LR2086 ).


Acknowledgements

The authors thank Prof. Barthelemy Nyasse (Organic Chemistry Department, University of Yaounde I) for the donation of pyridine and Tobias Storp (RWTH Aachen) for his technical support during X-ray experiments.

References

Bélombé, M. M., Nenwa, J. & Emmerling, F. (2009). Z. Kristallogr. New Cryst. Struct. 224, 239-240.
Brandenburg, K. (2010). DIAMOND. Crystal Impact GbR, Bonn, Germany.
Bruker (2004). SMART, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.
Chérif, I., Abdelhak, J., Zid, M. F. & Driss, A. (2011). Acta Cryst. E67, m1648-m1649.  [CSD] [CrossRef] [details]
Chérif, I., Abdelhak, J., Zid, M. F. & Driss, A. (2012). Acta Cryst. E68, m824-m825.  [CrossRef] [details]
Chérif, I., Zid, M. F., El-Ghozzi, M. & Avignant, D. (2012). Acta Cryst. E68, m900- m901.  [CrossRef] [details]
Farrugia, L. J. (1999). J. Appl. Cryst. 32, 837-838.  [CrossRef] [ChemPort] [details]
Nenwa, J., Bebga, G., Martin, S., Bélombé, M. M., Mbarki, M. & Fokwa, B. P. T. (2012). Acta Cryst. E68, m1325-m1326.  [CrossRef] [details]
Nenwa, J., Belombe, M. M., Ngoune, J. & Fokwa, B. P. T. (2010). Acta Cryst. E66, m1410.  [CSD] [CrossRef] [details]
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.  [CrossRef] [details]


Acta Cryst (2012). E68, m1434  [ doi:10.1107/S1600536812044303 ]

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