Polynuclear clusters of Fe(III) ions show great promise for designing new molecular magnets benefiting from the large spin of the S = 5/2 ground state of iron(III) ions. Polypyridyl linkers with their large aromatic system and potential donor sites can support the magnetic interactions when coordinate to the metal atoms. In this abstract we introduce the polydentate 2,4,6-tris-(2-pyridyl)-1,3,5-triazine ligand (tpt) into the Fe(III)-carboxylate system to produce a novel di- and heptanuclear iron clusters. Reaction of trinuclear Fe(III) pivalate clusters with the tpt ligand in acetone/ chloroform mixtures under hydrothermal conditions yielded the dinuclear cluster [Fe2OCl4(tpt)2] (1) (Fig. 1a), whereas interaction the same starting material in 1,4-dioxane or acetonitrile at room temperature produced heptanuclear clusters [Fe7O4(piv)12(tpt-O)]·n (solvent) [where solvent = 1,4-dioxane (2a), n = 4; acetonitrile (2b), n = 1] (Fig. 1b). The cluster compounds 1 and 2 were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction analysis. The thermal stability of the compound was investigated by TGA measurement. The result of the structure determination showed the formation of dinuclear core with two [FeCl2(tpt)] moieties with a rare linear Fe-O-Fe bridge and Fe···Fe distance of 3.609 Å. In 2, seven Fe(III) atoms are bridged by three 3-oxo and one -oxo bridges, 10 pivalate groups and tpt-O ligand, that coordinate to iron atoms via all N donor atoms. To the best of our knowledge, neither this cluster has been synthesised, nor is there any iron cluster of higher nuclearity with tpt as linker. Our research revealed a completely new iron(III)-cluster with unforeseen coordination to the ligand. Magnetic properties of 1 and 2 will also be discussed.figureFigure 1. Dinuclear [Fe2OCl4(tpt)2] (1, a) and heptanuclear [Fe7O4(piv)12(tpt-O)] (2, b) emphasizing their metallic cores (Fe atoms are shown as dark grey spheres).