Acta Cryst. (2008). E64, m529-m530  [ doi:10.1107/S1600536808005758 ]

Poly[[aqua-₃-picolinato-₂-picolinato-dipicolinatopotassium(I)terbium(III)] 2.5-hydrate]

L. Cunha-Silva, P. C. R. Soares-Santos, H. I. S. Nogueira, T. Trindade, J. Klinowski, J. Rocha and F. A. Almeida Paz

Abstract: In the title compound, [KTb(C₆H₄NO₂)₄(H₂O)]·2.5H₂O, each Tb³⁺ centre is coordinated by four N and five O atoms from five distinct picolinate ligands in a geometry resembling a highly distorted tricapped trigonal prism. One of the ligands establishes a skew bridge between neighbouring Tb³⁺ centres, leading to the formation of one-dimensional anionic polymeric chains, {[(C₆H₄NO₂)₄Tb]^-}_n, running along the direction [010]. Each K⁺ cation is seven-coordinated by six O atoms from one anionic polymeric chain and one water molecule [KO 2.676 (3)-3.208 (4) Å]. The uncoordinated water molecules are involved in O-HO hydrogen bonding.

Online 7 March 2008

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