Abstract
In the title compound, [Fe(C8H7N3)(H2O)4]SO4, the central Fe(II) ion is octa-hedrally coordinated by two N atoms from the bidentate 2-(pyridin-2-yl)-1H-imidazole ligand and by four O atoms of the aqua ligands. The largest deviation from the ideal octa-hedral geometry is reflected by the small N-Fe-N bite angle of 76.0 (1)°. The Fe-N coordination bonds have markedly different lengths [2.1361 (17) and 2.243 (2) Å], with the shorter one to the pyrimidine N atom. The four Fe-O coordination bond lengths vary from 2.1191 (18) to 2.1340 (17) Å. In the crystal, the cations and anions are arranged by means of medium-strength O-H⋯O hydrogen bonds into layers parallel to the ab plane. Neighbouring layers further inter-connect by N-H⋯O hydrogen bonds involving the imidazole fragment as donor group to one sulfate O atom as an acceptor. The resulting three-dimensional network is consolidated by C-H⋯O, C-H⋯π and π-π inter-actions.
Highlights
In the title compound, [Fe(C8H7N3)(H2O)4]SO4, the central FeII ion is octahedrally coordinated by two N atoms from the bidentate 2-(pyridin-2-yl)1H-imidazole ligand and by four O atoms of the aqua ligands
The largest deviation from the ideal octahedral geometry is reflected by the small N—Fe—N
Neighbouring layers further interconnect by N—H O hydrogen bonds involving the imidazole fragment as donor group to one sulfate O atom as an acceptor
Summary
Polynitrile anions have recently received considerable attention in the fields of coordination chemistry and molecular materials (Benmansour et al, 2010). These organic anions are of interest due to their ability to act towards metal atoms with various coordination modes and for their high degree of electronic delocalization (Miyazaki et al, 2003; Atmani et al., 2008; Benmansour et al, 2008, 2012; Setifi et al, 2002, 2013, 2014; Addala et al, 2015). In an attempt to prepare such an iron(II) complex using hydrothermal synthdoi:10.1107/S2056989015004417. Corresponding ones in the [Fe(dmbpy)(H2O)4]SO4 complex, which range from 2.079 (2) to 2.110 (2) Å. Esis, we obtained instead the title compound [Fe(pyim)(H2O)4]SO4, (I), where pyim is 2-(pyridin-2-yl)-1H-imidazole
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