Abstract
In the title compound, [Fe{(C5H4N)3N}2][C{C(CN)2}3], both ions lie across centres of inversion, with the anion being statistically disordered over two sets of atomic sites having equal occupancy. The cation and anion have approximate and 32 symmetry, respectively, and the Fe-N bond lengths indicate low-spin FeII. A combination of two-centre C-H⋯N and three-centre C-H⋯(N)2 hydrogen bonds link the ions into complex sheets. Several low-occupancy water mol-ecules are present, whose H atoms could not be located: accordingly, the reflection data were subjected to the SQUEEZE procedure [Spek (2015 ▸). Acta Cryst. C71, 9-18].
Highlights
In the title compound, [Fe{(C5H4N)3N}2][C{C(CN)2}3], both ions lie across centres of inversion, with the anion being statistically disordered over two sets of atomic sites having equal occupancy
A combination of two-centre C—HÁ Á ÁN and three-centre C—HÁ Á Á(N)2 hydrogen bonds link the ions into complex sheets
Several low-occupancy water molecules are present, whose H atoms could not be located: the reflection data were subjected to the SQUEEZE procedure [Spek (2015)
Summary
As a consequence of their ability to link metal ions in a variety of different ways, polynitrile anions, either functioning alone or in combination with neutral co-ligands, provide opportunities for the generation of molecular architectures with varying dimensions and topologies (Miyazaki et al, 2003; Benmansour et al, 2007, 2008, 2012; Atmani et al, 2008; Yuste et al, 2009). The presence of other potential donor groups such as those derived from –OH, –SH or –NH2, together with their rigidity and electronic delocalization, mean that polynitrile anions can lead to new bistable materials (Benmansour et al, 2010; Setifi et al, 2009, 2014; Pittala et al, 2017).
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