Crystal structure of tris-(2,2'-bi-pyridine)-cobalt(II) bis-(1,1,3,3-tetra-cyano-2-eth-oxy-propenide).

Jamila Benabdallah,Habib Boughzala,Fatima Setifi,Abderrahim Titi,Zouaoui Setifi

doi:10.1107/s2056989018018261

Abstract

In the title compound, [Co(C10H8N2)3](C9H5N4O)2, the tris-(2,2'-bi-pyridine)-cobalt(II) dication lies across a twofold rotation axes in the space group C2/c. The N atoms of the three bi-pyridine ligands form a distorted octa-hedron around the cobalt ion. All the N atoms of the polynitrile 1,1,3,3-tetra-cyano-2-eth-oxy-propenide anions participate in C-H⋯N hydrogen bonds ensuring crystal cohesion and forming a three-dimensional structure. The structure is further stabilized by C-H⋯π(cation) and anion⋯π(cation) inter-actions.

Highlights

Ternary complexes of transition metals are mixed complexes where the transition-metal center is coordinated by more than one type of ligand (Gaamoune et al, 2010; Setifi et al, 2016; Yuste et al, 2009)
The complex salt consists of half a tris(2,20-bipyridine)cobalt(II) cation, the CoII ion being located on a twofold rotation axis, and a 1,1,3,3-tetracyano-2-ethoxypropenide, anion
The cobalt ion is ligated by the N atoms of the 2,20-bipyridine ligands forming a slightly distorted octahedral coordination sphere; the Co1—N bond lengths vary from 2.122 (3) to 2.148 (3) A

Summary

Chemical context

Ternary complexes of transition metals are mixed complexes where the transition-metal center is coordinated by more than one type of ligand (Gaamoune et al, 2010; Setifi et al, 2016; Yuste et al, 2009). Organic polynitrile anions are among the compounds able to form this type of complex In addition to their ability to create original structures and different coordination modes, these organic anions exhibit interesting behaviour thanks to their high electronic delocalization (Thetiot et al, 2003; Setifi et al, 2016) and magnetic properties (Benmansour et al, 2008, 2010). Several studies of polynitrile ternary complexes with different transition metals and different co-ligands have been realized (Benmansour et al, 2008; Gaamoune et al, 2010; Setifi et al, 2013, 2014b, 2017; Addala et al, 2015) To synthesize such types of complexes we chose 2,20-bipyridine as co-ligand and cobalt(II) as the transition metal, in view of its promising applications in therapy and imaging, as well as in dye-sensitized solar cells (Renfrew et al, 2017; Yum et al, 2012).

Structural commentary

Supramolecular features

Database survey

Refinement

Funding information

C20 C21 C22 O1 C23 H23A H23B C24 H24C H24B H24A