Received 21 February 2014
The slightly yellow-coloured title complex, [Zn(C18H16N4O4)(H2O)]n, crystallizes with one molecule in the asymmetric unit. The structure clearly shows the mer-4O,O,N,N-binding mode of the N,N'-bis-(2-cyano-ethylpropenoyl)-1,2-diamidobenzene ligand stabilizing the Zn centre of a distorted octahedral environment. The fifth coordination site in one apical position is held by a coordinating solvent water molecule whereas the complete octahedral coordination sphere is completed by coordination of one N atom from a CN group of a neighbouring molecule, leading to the final polymeric structure consisting of zigzag staggered chains in parallel orientation along the c-axis direction. Between the coordinated water solvent molecule and the N atoms of uncoordinated cyano-groups of neighboured units, two H-bridge bonds are formed. One of these H-bridge bonds is of inter- whereas the other of intra-strand nature, leading to a two-dimensional network parallel to (110) stabilizing the supramolecular structure. Six Zn-O or Zn-N bonds are found with lengths ranging from 2.061 (1) to 2.185 (1) Å and bond angles about the Zn atom are clustered in the ranges 79.83 (4)-104.21 (4) and 167.05 (4)-170.28 (4)°.
The structures of ZnII complexes with ligands stabilizing comparable complex geometries can be found in Barnard et al. (2009), Ryu et al. (2003) or Tanase et al. (2001). In Tanase et al. (2001), the ligands show comparable N,N,O,O-coordination with respect to a different ligand backbone whereas in Ryu et al. (2003) and Barnard et al. (2009), the ligands with N,N,N,N-coordination are diaminobenzene derivatives. In Fuchs et al. (2014), a mononuclear Zn complex is presented with the same ligand but a dmso molecule in the coordination sphere of the metal stabilizing a different complex geometry. For the synthesis, see: Jäger et al. (1985).
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: SHELXL2013 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information for this paper is available from the IUCr electronic archives (Reference: NK2220 ).
The authors gratefully acknowledge financial support for their work from the Karlsruhe Institute for Technology.
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