| Summary: | In the title complex, {[Tb(C6H5NO2)3(H2O)2](ClO4)3·H2O}n, the TbIII ion is coordinated by six O atoms from six isonicotinate (inic) ligands and two water molecules, displaying a bicapped trigonal-prismatic geometry. The inic ligands, which are protonated at the pyridine N atom, link the metal centres, forming a polymeric chain running parallel to the a axis. The chains are further assembled via intra- and intermolecular O—H...O and N—H...O hydrogen-bonding interactions into a three-dimensional supramolecular network involving the inic ligands, the water molecules and the perchlorate anions. One of the perchlorate ions is disordered over two sites with occupancies of 0.561 (17) and 0.439 (17).
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