Poly[chlorido-μ3-1,2,4-triazolato-iron(II)

Abstract

The title compound, [Fe(C2H2N3)Cl]n, was prepared from a hydro­thermal reaction of iron(II) chloride and 1,2,4-triazole. It is isostructural with its MnII, CoII, NiII and ZnII analogues. The FeII cation shows a slightly distorted square-based pyramidal coordination environment, being surrounded by three crystallographically independent N atoms of three different triazolate ligands and a chloride ligand. A polymeric layer is formed by the triply bridging nature of the 1,2,4-triazolate ligand, which is bonded to three different Fe atoms through its three N atoms. The layer contains both binuclear units and tetra­nuclear units. In the binuclear units, two Fe atoms are bridged by two nearly coplanar triazolate groups through the 1,2-positions, affording a six-membered ring around an inversion center. Each binuclear unit is further connected to four parallel units through the coordination of the N atoms of the triazolate groups. Four adjacent units, which are pairwise parallel, afford 16-membered tetra­nuclear units, in each of which the two nearest-neighbor Fe atoms are bridged by a single triazolate group through the 1,4-positions.