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


In the title compound, [KTb(C(6)H(4)NO(2))(4)(H(2)O)]center dot 2.5H(2)O, each Tb(3+) 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 Tb(3+) centres, leading to the formation of one-dimensional anionic polymeric chains, {[(C(6)H(4)NO(2))(4)Tb](-)}(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 [K center dot center dot center dot O 2.676 (3)-3.208 (4) angstrom]. The uncoordinated water molecules are involved in O-H center dot center dot center dot O hydrogen bonding.



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Cunha-Silva, L; Soares-Santos, PCR; Nogueira, HIS; Trindade, T; Klinowski, J; Rocha, J; Paz, FAA

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