Crystal structure of tetra-aqua-(5,5'-dimethyl-2,2'-bipyridyl-κ(2) N,N')iron(II) sulfate.

Yamine Belamri,Sladjana B Novaković,Fatima Setifi,Setifi Zouaoui,Bojana M Francuski

doi:10.1107/s1600536814024982

Abstract

In the title compound, [Fe(C12H12N2)(H2O)4]SO4, the central Fe(II) ion is coordinated by two N atoms from the 5,5'-dimethyl-2,2'-bi-pyridine ligand and four water O atoms in a distorted octa-hedral geometry. The Fe-O coordination bond lengths vary from 2.080 (3) to 2.110 (3) Å, while the two Fe-N coordination bonds have practically identical lengths [2.175 (3) and 2.177 (3) Å]. The chelating N-Fe-N angle of 75.6 (1)° shows the largest deviation from an ideal octa-hedral geometry; the other coordination angles deviate from ideal values by 0.1 (1) to 9.1 (1)°. O-H⋯O hydrogen bonding between the four aqua ligands of the cationic complex and four O-atom acceptors of the anion leads to the formation of layers parallel to the ab plane. Neighbouring layers further inter-act by means of C-H⋯O and π-π inter-actions involving the laterally positioned bi-pyridine rings. The perpen-dicular distance between π-π inter-acting rings is 3.365 (2) Å, with a centroid-centroid distance of 3.702 (3) Å.

Highlights

20 Août 1955-Skikda, BP 26, Route d’El-Hadaiek, Skikda 21000, Algeria, and dUnité de Recherche de Chimie de l’Environnement et Moléculaire Structurale (CHEMS), Université Constantine 1, Constantine 25000, Algeria
In the title compound, [Fe(C12H12N2)(H2O)4]SO4, the central FeII ion is coordinated by two N atoms from the 5,50 -dimethyl-2,20 -bipyridine ligand and four water O atoms in a distorted octahedral geometry
O—H O hydrogen bonding between the four aqua ligands of the cationic complex and four O-atom acceptors of the anion leads to the formation of layers parallel to the ab plane

Summary

Chemical context

Coordination compounds containing polynitrile anions as ligands are of current interest for their magnetic properties and their rich architectures and topologies (Setifi et al, 2003; Gaamoune et al, 2010; Váhovská & Potočňák, 2012; Setifi, Setifi et al, 2013; Setifi, Domasevitsch et al, 2013; Potočňák et al, 2014). In an attempt to prepare such a complex, we obtained the title compound, [Fe(dmbpy)(H2O)4]SO4, (I), where dmbpy is 5,50 -dimethyl-2,20 -bipyridyl. The crystal structures of several complexes with general formula [M(bpy)(H2O)4]2+ comprising bipyridine derivatives doi:10.1107/S1600536814024982. This is the first complex of this type with FeII as the central ion. Of the octahedron is formed by a pair of nitrogen donors from the 5,50 -dimethyl-2,20 -bipyridyl ligand and two molecules of water, while the axial sites are occupied by two other water molecules. 75.6 (1) shows the most significant deviation from an ideal octahedral geometry. The other angular distortions from an ideal octahedral geometry are in the range 0.1 (1) to 9.1 (1). The S—O bond lengths [1.466 (3)–1.480 (3) Å] and O—S—O angles [108.8 (2)–109.9 (2) ] indicate a nearly ideal tetrahedral geometry for the anion

Supramolecular features

Synthesis and crystallization

Refinement details