Bis[μ-bis(pyridin-2-yl)methanone oxime-κ3 N:,N′,N′′]bis[diacetato-κ2 O,O′;κO-zinc(II)]

The structure of the title compound is triclinic containing half of the molecule in the asymmetric unit. Each zinc atom is coordinated to a pyridyl and oxime nitrogen from one ligand and a third nitrogen from the other dpko pyridyl ring and two acetato anions.

The structure of the title complex, [Zn 2 (C 2 H 3 O 2 ) 4 (C 11 H 9 N 3 O) 2 ], is triclinic containing half of the molecule in the asymmetric unit.Each zinc atom is coordinated to a pyridyl and oxime nitrogen from one di-2-pyridyl ketone oxime (dpko) ligand and a third nitrogen from the other dpko pyridyl ring.Additionally, each zinc is coordinated to two acetato anions, one of which is bidentate and the other monodentate.The uncoordinated oxygen of the monodentate acetato group is involved in a hydrogen bond with the oxime hydrogen.The packing in the crystal is assisted by weak C-H� � �O interactions between acetato groups and neighboring pyridyl rings.

Structure description
The three N atoms in dpko can act as ligands in a variety of ways.Previous reactions of Zn II with dpko led to molecules of the form Zn(dpko)Cl 2 (Alexiou et al., 2003;Go ¨kce et al., 2019) and Zn(dpko)Br 2 (Westcott et al., 2016) where both pyridyl N atoms are bonding to the metal and the oxime group is directed away from the metal center.Dpko ligands with zinc have also been shown to retain their bidentate nature, yet they opt to bond via one pyridyl nitrogen and the oxime nitrogen (Tarushi et al., 2013).Finally, in this complex a third motif is seen; one where a pyridyl nitrogen and oxime nitrogen bond to one zinc and the other pyridyl nitrogen binds to another.In this case a dimer is made and is analogous to Cu 2+ complexes with dpko (Goher & Mautner, 1999) and to Mg 2+ complexes with dpko (Milios et al., 2005).
The asymmetric-unit of the the title complex, Fig. 1, comprises one-half molecule with the full molecule generated by inversion symmetry.Two acetate anions are also coordinated to the zinc.The first acetato group bonds with both O atoms at bond lengths of 2.1369 (17) and 2.289 (2) A ˚and the second acetato group coordinates through one oxygen at 2.0513 (14) A ˚.The second oxygen on the monodentate acetate is hydrogen bonded to the hydrogen on the oxime, Table 1.The packing in the crystal is assisted by weak C-H� � �O interactions between acetato groups and neighboring pyridyl rings(Table 1).

Refinement
Crystal data, data collection and structure refinement details are summarized in Table 2.

Figure 1
An ORTEP style (Farrugia, 2012) view of the title compound.Displacement ellipsoids are drawn at the 50% probability level.All hydrogen atoms not involved in hydrogen bonding have been omitted and non-H atoms generated by the inversion center have not been labeled.(Sheldrick, 2008), SHELXL (Sheldrick, 2015), and OLEX2 (Dolomanov et al., 2009).

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.

data reports data-2
IUCrData (2024).9, x240122 Refinement.Hydrogen atoms on sp2 and sp3 carbons were placed at calculated positions with a C-H distance of 0.93?Å and 0.96?Å and were included in the refinement in riding motion approximation with Uiso = 1.2Ueq or 1.5Ueq of the carrier atom, respectively.The position and thermal parameters for the oxime hydrogen were allowed to refine freely.Geometric parameters (Å, º)

Table 2
Experimental details.