Fe and Mn complexes based on 2,4,6-tris(2-pyridyl)-triazine: synthesis, structures, magnetic and biological properties.

Reaction of the polypyridyl ligand 2,4,6-tris(2-pyridyl)--triazine (tpt) with mono- and polynuclear Fe(iii) or Mn(ii) precursors, specifically tri- or hexanuclear Fe(iii) pivalates (piv), [MnO(piv)(Hpiv)] and Mn(ii) isobutyrate (ib), in various solvents and under various reaction conditions showcase the ligand's surprising coordination characteristics. The reactions result in mononuclear [Fe(tpt)(tptH)][FeCl]·2(thf)·0.23(HO) (1), [Fe(piv)(tpt)Cl] (2), [Fe(tpt)Cl]·2(HO) (3a), dinuclear [Fe O(tpt)Cl] (3), and heptanuclear [Fe O(piv)(tpt-O)]·A [A = MeCN (4a) or 4(dioxane) (4b)] and [Fe O(piv)(tpt-O)(i-PrO)(i-PrOH)]·0.