Received 19 November 2012
In the structure of the title complex, [Cs(C6H2Cl3N2O2)(H2O)]n, the caesium salt of the commercial herbicide picloram, the Cs+ cation lies on a crystallographic mirror plane, which also contains the coordinating water molecule and all non-H atoms of the 4-amino-3,5,6-trichloropicolinate anion except the carboxylate O-atom donors. The irregular CsCl4O5 coordination polyhedron comprises chlorine donors from the ortho-related ring substituents of the picloramate ligand in a bidentate chelate mode, with a third chlorine bridging [Cs-Cl range 3.6052 (11)-3.7151 (11) Å] as well as a bidentate chelate carboxylate group giving sheets extending parallel to (010). A three-dimensional coordination polymer structure is generated through the carboxylate group, which also bridges the sheets down . Within the structure, there are intra-unit water O-HOcarboxylate and amine N-HNpyridine hydrogen-bonding interactions.
For background information on picloram, see: Mullinson (1985); O'Neil (2001). For examples of structures of metal complexes with picloram, see: Smith et al. (1981a,b); O'Reilly et al. (1983). For another structure with caesium cations involving coordinating carbon-bound Cl, see: Levitskaia et al. (2000). For a caesium complex with dipicolinic acid, see: Santra et al. (2011).
Data collection: CrysAlis PRO (Agilent, 2012); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008) within WinGX (Farrugia, 2012); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: PLATON.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: WM2705 ).
The author acknowledges financial support from the Science and Engineering Faculty and the University Library, Queensland University of Technology.
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