Crystal structure and Hirshfeld surface analysis of 6,6′-dimethyl-2,2′-bipyridine-1,1′-diium tetrachloridocobaltate(II)

Abstract

In the title molecular salt, (C12H14N2)[CoCl4], the dihedral angle between the pyridine rings of the cation is 52.46 (9)° and the N—C—C—N torsion angle is −128.78 (14)°, indicating that the ring nitrogen atoms are in anti-clinal conformation. The Cl—Co—Cl bond angles in the anion span the range 105.46 (3)–117.91 (2)°. In the extended structure, the cations and anions are linked by cation-to-anion N—H...Cl and C—H...Cl interactions, facilitating the formation of R44(18) and R44(20) ring motifs. Furthermore, the crystal structure features weak anion-to-cation Cl...π interactions [Cl...π = 3.4891 (12) and 3.5465 (12) Å]. Hirshfeld two-dimensional fingerprint plots revealed that the most significant interactions are Cl...H/H...Cl (45.5%), H...H (29.0%), Cl...C/C...Cl (7.8%), Cl...N/N...Cl (3.5%), Cl...Cl (1.4) and Co...H (1%) contacts.

Keywords

• cobalt complex
• substituted bipyridine
• hirshfeld surface analysis
• crystal structure