catena-Poly[[[bis(acetonitrile-κN)(4,4′-dimethoxy-2,2′-bipyridine-κ2 N,N′)copper(II)]-μ-trifluoromethanesulfonato-κ2 O:O′] trifluoromethanesulfonate]

The title CuII complex shows the typical Jahn–Teller distortion of the octahedral coordination sphere, defined by the N atoms of a 4,4′-dimethoxy-2,2′-bipyridine and two acetonitrile ligands in the equatorial plane and two O atoms of trifluoromethanesulfonate anions in the elongated axial positions.

As depicted in Fig. 1, the asymmetric unit of the title compound comprises a Cu II atom, one N,N 0 -chelating 4,4 0 -dimethoxy-2,2 0 -bipyridine ligand, two acetonitrile ligands, and data reports two trifluoromethanesulfonate anions. The central copper(II) atom exhibits a tetragonally distorted octahedral coordination environment defined by the N atoms of the chelating 4,4 0dimethoxy-2,2 0 -bipyridine ligand and two neutral acetonitrile molecules in the equatorial plane and by two O atoms of symmetry-related trifluoromethanesulfonate anions in axial positions. Although the Cu-N bond lengths with the bipyridine ligand are shorter than the Cu-N bond lengths with the coordinating acetonitrile molecules, their values are comparable with the reported values of other copper(II) complexes with the same chelating ligand (Fettouhi, 2017). The acetonitrile ligands are bordering on linearity. All relevant bond lengths and angles involving the Cu II atom are presented in Table 1. The cations in the title complex are aligned into polymeric chains extending parallel to the a-axis direction and pack into layers parallel to the bc plane, as illustrated in the crystal packing diagram given in Fig. 2. This arrangement leaves voids in which the second type of tri-fluoromethanesulfonate anions are located. These anions are non-coordinating and interact through hydrogen bonds.
Graph-set analysis is a method of analyzing hydrogenbonding patterns in three-dimensional networks. Hydrogenbonding patterns are classified into one of four pattern designators; rings (R), chains (C), intramolecular hydrogenbonding patterns described as self (S), finite hydrogenbonding patterns described as discrete (D). These designators include a superscript with the number of acceptor atoms, subscript with the number of donor atoms, and a number in parentheses indicating the number of atoms in the hydrogenbonding motif (Grell et al., 1999).
There are three types of hydrogen-bonding motifs present in the crystal lattice, with numerical values collated in Table 2. A centrosymmetric hydrogen-bonding ring, R 1 2 (7), occurs between the O4 atom on the coordinating trifluoromethanesulfonate anion with two hydrogen atoms on a 4,4 0 -dimethoxybipyridine molecule on a neighboring asymmetric unit. The non-coordinating trifluoromethanesulfonate anion forms a hydrogen-bonding ring, R 2 2 (12), through two C-HÁ Á ÁO interactions with the O6 and O7 atoms. The other oxygen atom, O8, on the non-coordinating trifluoromethanesulfonate anion, has a discrete hydrogen-bonding interaction, D 1 1 (3), with a neighboring coordinating acetonitrile molecule.

Figure 1
Asymmetric unit of the title compound with displacement ellipsoids drawn at the 50% probability level; H atoms are omitted for clarity. the removal of AgCl by filtration, using a 0.45 mm PTFE syringe filter, the resulting blue solution was used to grow crystals by vapor diffusion with diethyl ether at 278 K.

Refinement
Crystal data, data collection and structure refinement details are summarized in Table 3. The highest remaining electron density is located 0.93 Å from atom O3.  where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max = 0.001 Δρ max = 2.01 e Å −3 Δρ min = −0.46 e Å −3 data-2 IUCrData (2020). 5, x201407 Special details Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.