Received 14 May 2013
The title one-dimensional coordination polymer, [Zn(C9H4O6)(C5H5N)2]n or [Zn(HBTC)(py)2]n, (I), where BTC is benzene-1,3,5-tricarboxylate and py is pyridine, is a solvent-free polymorph of [Zn(HBTC)(py)2]·2C2H5OH [Yaghi et al. (1997). Chem. Mater. 9, 1074-1076]. Differences in the spatial arrangements and supramolecular packing of the [Zn(HBTC)(py)2]n chains in the two structures are described. The chain in (I) extends parallel to  and is severely puckered, with a ZnZn distance of 8.3599 (3) Å and a ZnZnZn angle of 107.516 (3)°, as a result of hydrogen-bonding interactions of the types O-HO and C-HO. There is no evidence for - interactions in (I). The differences between the solvent-free and solvent-containing structures can be accounted for by the absence of the ethanol solvent molecule and the use of the converging pair of O atoms in the bis-monodentate bridging HBTC2- ligand in (I).
For the ethanol monosolvate of (I), see: Yaghi et al. (1997). For a review on supramolecular isomerism in coordination compounds, see: Zhang et al. (2009).
Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008) and WinGX (Farrugia, 2012); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2008) and WinGX; molecular graphics: DIAMOND (Brandenburg, 1999); software used to prepare material for publication: publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: CQ2004 ).
This work was financially supported by the Thailand Research Fund and the National Research University Project.
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