Bis(3-methylpyridinium) tetrachloridocuprate(II)

Abstract

The title compound, (C6H8N)2[CuCl4], is composed of two 3-methyl­pyridinium cation and one tetra­chloridocuprate(II) anion. The geometry around the copper(II) ion is that of a distorted tetra­hedron. In the crystal structure, the anions and cations are linked by three different N—H⋯Cl hydrogen bonds. In addition, the crystal structure exhibits aromatic π–π inter­actions between the pyridinium rings of two discrete units [centroid–centroid distance = 3.704 (2) Å].

Crystal structure and electrical properties study of 4-aminopyridinium chloridobismuthate (III) (C5N2H7)4.HBi2Cl11

“…Thus, the π stacking interactions are quite weak and are of no interest to be discussed here. All bonds and angles for the cations agree with the corresponding values found in other molecular-ionic 4-aminopyridinium salts [22][23][24] showing slight deviation to those of the 4-aminopyridine crystal [25,26]. The protonation of the N12 and N13 atoms of 4-aminopyridine leads to the widening of C19-N12-C21 and C17-N13-C18 angles in the pyridinium ring to 121.6(6)°and 121.2(5)°, compared to 115.25(13)°i n 4-aminopyridine [26].…”