Received 24 June 2013
aResearch and Development Centre, Bharathiyar University, Coimbatore 641 046, India,bDepartment of Physics, Rajeswari Vedachalam Government Arts College, Chengalpet 603 001, India, and cDepartment of Physics, The New College (Autonomous), Chennai 600 014, India
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The title compound, (NH4)2[Zn(NCS)4]·2C12H24O6·H2O, the result of the reaction of ammonium thiocyanate, 18-crown-6 and zinc(II) chloride in aqueous solution, exhibits an unusual supramolecular structure. The Zn atom, two of the thiocyanate chains and a water molecule, disordered over two positions, lie on a mirror plane. The macrocycle adopts a conformation with approximate D3d symmetry. The ammonium molecules are contained within the bowl of the macrocycle via extensive N-HO hydrogen bonds and the complex molecules are linked via N-HS hydrogen bonds, forming chains along the c-axis direction. The macrocycle is disordered over two positions [refined occupancy ratio = 0.666 (8):0.334 (8)]. The S atoms of two isothiocyanate ligands are disordered within and about the mirror plane.
Data collection: APEX2 (Bruker, 2004); cell refinement: APEX2 and SAINT (Bruker, 2004); data reduction: SAINT and XPREP (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae et al., 2008); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SU2617 ).
The authors are thankful to the SAIF, IIT Madras, for the data collection. KR thanks the University Grants Commission, Government of India, for financial support granted under a Major Research Project [F. No.41-1008/2012 (SR)].
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