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Volume 69 
Part 2 
Page m125  
February 2013  

Received 12 January 2013
Accepted 23 January 2013
Online 31 January 2013

Key indicators
Single-crystal X-ray study
T = 293 K
Mean [sigma](C-C) = 0.009 Å
Disorder in main residue
R = 0.028
wR = 0.067
Data-to-parameter ratio = 18.9
Details
Open access

catena-Poly[[bis([mu]2-1,4,7,10,13,16-hexaoxacyclooctadecane)dipotassium]-[mu]2-iodido-(iodidocadmium)-di-[mu]2-iodido-(iodidocadmium)-[mu]2-iodido]

aDepartment of Physics, Rajeswari Vedachalam Government Arts College, Chengalpet 603 001, India,bResearch and Development Centre, Bharathiyar University, Coimbatore 641 046, India, and cDepartment of Physics, The New College (Autonomous), Chennai 600 014, India
Correspondence e-mail: drkrr2007@gmail.com, mnizam_new@yahoo.in

The reaction of CdCl2, 18-crown-6 and KI in water yields the title coordination polymer, [{K(C12H24O6)}2Cd2I6]n. The potassium ion lies approximately in the plane of the crown ether, coordinated by all six crown ether O atoms and also by an iodide anion bound to a cadmium atom. A C atom of the crown ether is disordered over two positions with site occupancies of 0.77 (2) and 0.23 (2). Two K(18-crown-6)+ units are linked by inversion symmetry, forming a [bis([mu]2-18-crown-6)dipottasium] system with approximately square-planar K2O2 units. Inversion symmetry also generates the Cd2I6 fragment and the polymeric system is extended along the c axis by the formation of K-I-Cd bridges.

Related literature

For applications of polyiodides, see: Yang et al. (2011[Yang, Y., Sun, R., Shi, C., Wu, Y. & Xia, M. (2011). Int. J. Photoenergy, Article ID 986869, 5 pages; doi:10.1155/2011/986869.]). For the properties of cadmium compounds, see: Ramesh et al. (2012[Ramesh, V., Rajarajan, K., Kumar, K. S., Subashini, A. & NizamMohideen, M. (2012). Acta Cryst. E68, m335-m336.]). For related structures, see: Park et al. (2010[Park, B. K., Eom, G. H., Kim, S. H., Kwak, H., Yoo, S. M., Lee, Y. J., Kim, C., Kim, S. J. & Kim, Y. (2010). Polyhedron, 29, 773-786.]); Guo et al. (2006[Guo, H.-X., Yang, L.-M., Lin, Z.-X. & Zou, X.-J. (2006). Acta Cryst. E62, m2863-m2865.]); Kunz et al. (2009[Kunz, K., Lerner, H.-W. & Bolte, M. (2009). Acta Cryst. E65, m171.]).

[Scheme 1]

Experimental

Crystal data
  • [Cd2K2I6(C12H24O6)2]

  • Mr = 796.51

  • Monoclinic, P 21 /c

  • a = 10.627 (2) Å

  • b = 14.986 (2) Å

  • c = 15.190 (3) Å

  • [beta] = 103.959 (1)°

  • V = 2347.7 (7) Å3

  • Z = 4

  • Mo K[alpha] radiation

  • [mu] = 5.07 mm-1

  • T = 293 K

  • 0.20 × 0.15 × 0.10 mm

Data collection
  • Bruker Kappa APEXII CCD diffractometer

  • Absorption correction: multi-scan (SADABS; Sheldrick, 2004[Sheldrick, G. M. (2004). SADABS. University of Göttingen, Germany.]) Tmin = 0.430, Tmax = 0.631

  • 21969 measured reflections

  • 4129 independent reflections

  • 3585 reflections with I > 2[sigma](I)

  • Rint = 0.025

Refinement
  • R[F2 > 2[sigma](F2)] = 0.028

  • wR(F2) = 0.067

  • S = 1.03

  • 4129 reflections

  • 219 parameters

  • 6 restraints

  • H-atom parameters constrained

  • [Delta][rho]max = 1.53 e Å-3

  • [Delta][rho]min = -1.16 e Å-3

Data collection: APEX2 (Bruker, 2004[Bruker (2004). APEX2, SAINT and XPREP. Bruker AXS Inc., Madison, Wisconsin, USA.]); cell refinement: APEX2 and SAINT (Bruker, 2004[Bruker (2004). APEX2, SAINT and XPREP. Bruker AXS Inc., Madison, Wisconsin, USA.]); data reduction: SAINT and XPREP (Bruker, 2004[Bruker (2004). APEX2, SAINT and XPREP. Bruker AXS Inc., Madison, Wisconsin, USA.]); 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: ORTEP-3 for Windows (Farrugia, 2012[Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849-854.]) and Mercury (Macrae et al., 2008[Macrae, C. F., Bruno, I. J., Chisholm, J. A., Edgington, P. R., McCabe, P., Pidcock, E., Rodriguez-Monge, L., Taylor, R., van de Streek, J. & Wood, P. A. (2008). J. Appl. Cryst. 41, 466-470.]); software used to prepare material for publication: WinGX (Farrugia, 2012[Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849-854.]) and PLATON (Spek, 2009[Spek, A. L. (2009). Acta Cryst. D65, 148-155.]).


Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SJ5295 ).


Acknowledgements

The authors thank Dr Babu Vargheese, SAIF, IIT, Madras, India, for his help in collecting the X-ray intensity data. KR thanks the University Grants Commission for financial support granted under a Major Research Project [F. No. 41-1008/2012 (SR)].

References

Bruker (2004). APEX2, SAINT and XPREP. Bruker AXS Inc., Madison, Wisconsin, USA.
Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849-854.  [ISI] [CrossRef] [ChemPort] [details]
Guo, H.-X., Yang, L.-M., Lin, Z.-X. & Zou, X.-J. (2006). Acta Cryst. E62, m2863-m2865.  [CSD] [CrossRef] [details]
Kunz, K., Lerner, H.-W. & Bolte, M. (2009). Acta Cryst. E65, m171.  [CSD] [CrossRef] [details]
Macrae, C. F., Bruno, I. J., Chisholm, J. A., Edgington, P. R., McCabe, P., Pidcock, E., Rodriguez-Monge, L., Taylor, R., van de Streek, J. & Wood, P. A. (2008). J. Appl. Cryst. 41, 466-470.  [ISI] [CrossRef] [ChemPort] [details]
Park, B. K., Eom, G. H., Kim, S. H., Kwak, H., Yoo, S. M., Lee, Y. J., Kim, C., Kim, S. J. & Kim, Y. (2010). Polyhedron, 29, 773-786.  [ISI] [CSD] [CrossRef] [ChemPort]
Ramesh, V., Rajarajan, K., Kumar, K. S., Subashini, A. & NizamMohideen, M. (2012). Acta Cryst. E68, m335-m336.  [CrossRef] [ChemPort] [details]
Sheldrick, G. M. (2004). SADABS. University of Göttingen, Germany.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.  [CrossRef] [details]
Spek, A. L. (2009). Acta Cryst. D65, 148-155.  [ISI] [CrossRef] [details]
Yang, Y., Sun, R., Shi, C., Wu, Y. & Xia, M. (2011). Int. J. Photoenergy, Article ID 986869, 5 pages; doi:10.1155/2011/986869.


Acta Cryst (2013). E69, m125  [ doi:10.1107/S1600536813002274 ]

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