Acta Cryst. (2013). E69, m22-m23
[ doi:10.1107/S1600536812049562 ]

Poly[(₆-4-amino-3,5,6-trichloropyridine-2-carboxylato)aquacaesium]

G. Smith

Abstract: 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 [010]. Within the structure, there are intra-unit water O-HO_carboxylate and amine N-HN_pyridine hydrogen-bonding interactions.

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