Abstract
In the title compound, [Fe(C11H11N3)2](C10N6), the FeII cation is coordinated by two bis(pyridin-2-yl)methanamine (dipa) ligands and has crystallographic twofold symmetry. There are deviations from ideal octa-hedral geometry due to the steric requirements of the ligands. The polynitrile 1,1,3,3-tetra-cyano-2-(di-cyano-methylid-ene)propane-1,3-diide (tcpd2-) dianion is disordered about an inversion center and is not coordinated to the Fe atom. The anion is not planar but has a propeller shape. In the crystal, weak N-H⋯N inter-actions between the amine H atoms of the dipa ligands and two nitrile groups of the anion form an alternating chain of cations and anions related by the C-centering of the unit cell.
Highlights
Polynitrile anions have recently received considerable attention in the fields of coordination chemistry and molecular materials (Benmansour et al, 2010)
Structural commentary The structure is built from FeII cations coordinated by two bis(pyridin-2-yl)methanamine (C11H11N3; dipa) ligands, and 1,1,3,3-tetracyano-2-(dicyanomethylidene)propane-1,3-diide (C10N62À; tcpd2À) anions
The Fe atom lies on a twofold axis, with its coordinated dipa ligands related by the twofold axis (Fig. 1)
Summary
Polynitrile anions have recently received considerable attention in the fields of coordination chemistry and molecular materials (Benmansour et al, 2010). 2. Structural commentary The structure is built from FeII cations coordinated by two bis(pyridin-2-yl)methanamine (C11H11N3; dipa) ligands, and 1,1,3,3-tetracyano-2-(dicyanomethylidene)propane-1,3-diide (C10N62À; tcpd2À) anions. The Fe atom lies on a twofold axis, with its coordinated dipa ligands related by the twofold axis (Fig. 1). The dipa ligand assumes the butterfly conformation found previously (Setifi et al, 2017), with an approximate mirror plane bisecting the ligand, and the pyridine rings are at an angle of 56.66 (6) to each other. The tcpd2À anion, which is disordered about a crystallographic inversion center, is propeller-shaped, with approximate C3 symmetry, and a geometry similar to that described previously by Setifi et al (2015).
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