catena -Poly[[(8-aminoquinoline)cobalt(II)]-di- l -azido]

The title coordination polymer, [Co(N3)2(C9H8N2)]
 n
 , was synthesized solvothermally. The CoII atom exhibits a distorted octahedral [CoN6] coordination geometry with a bidentate 8-aminoquinoline ligand and four azide ligands. Bridging azide ligands result in chains extending along [100]. N—H...N hydrogen bonds join the chains to give an extended structure with sheets parallel to (002).

The title coordination polymer, [Co(N 3 ) 2 (C 9 H 8 N 2 )] n , was synthesized solvothermally.The Co II atom exhibits a distorted octahedral [CoN 6 ] coordination geometry with a bidentate 8-aminoquinoline ligand and four azide ligands.Bridging azide ligands result in chains extending along [100].N-H� � �N hydrogen bonds join the chains to give an extended structure with sheets parallel to (002).
One of the pseudohalide ligands that has received much attention in the last decade is the azide [N 3 À ] ion, partly due to its ability to produce a wide variety of coordination compounds with different nuclearities ranging from simple mononuclear to polynuclear species.Different bonding modes are observed with the azide ion, which result in the formation of one-, two-and three-dimensional polymeric assemblies (Escuer et al., 2006).
As a part of our continuing study of the structural and magnetic properties of transition-metal complexes containing both azide and polypyridyl units (Setifi, Ghazzali et al., 2016;Setifi, Knaust et al., 2016;Setifi, Moon et al., 2016;Benamara et al., 2021;Merabet et al., 2023;Setifi, Setifi et al., 2022, 2023), we report herein the crystal and molecular structure of a one-dimensional coordination polymer, (I), based on 8-aminoquinoline (8aquin) as co-ligand and the azide anion as ligand with two different coordination modes.
The asymmetric unit of (I) is composed of a Co II ion, a bidentate 8-aquin ligand and two azide ligands.The distorted octahedral coordination sphere is completed by two additional azide ligands.One of the azide anions binds to two Co centers in a 1,3 bidentate mode, whereas the other one connects two Co centers in a 1,1 bidentate mode.The resulting coordination geometry and supramolecular association is shown in Fig. 1.Pertinent Co-N bond lengths are exhibited in Table 1.
The bridging ligands result in polymeric chains extending parallel to [100], as shown in Fig. 2. The chains are composed of Co II ions joined by alternating bis �-(1,1-N 3 ) units and bis �-(1,3-N 3 ) units with corresponding Co� � �Co separations of 3.2817 (5) and 5.2427 (7) A ˚, respectively.The angle between the (N 3 ) 2 mean plane of the double end-to-end azide bridges and the plane defined by the Co II and the bonded N azide atom is 20.20 (14) � , corresponding to a flattened chair configuration for the eight-membered ring.For a flat bridge, an angle of 0 � would be observed.This angle compares to values of 8.2 (2) and 25.6 (1) � for the structurally similarly bridged polymorphic Fe II complexes with a 5,5 0 -dimethyl-2,2 0 -bipyridine ligand (Setifi, Berne `s et al., 2022).In the 8-acquin complexes of Mn II and Co II , the comparable angles are 20.3 (6) � and 25.5 (4) � , respectively (Benamara et al., 2021).

Synthesis and crystallization
The title compound was prepared solvothermally under autogenous pressure from a mixture of cobalt(II) sulfate heptahydrate (28 mg, 0.1 mmol), 8-aminoquinoline (14 mg, data reports 2 of 4 Setifi et al. � [Co(N 3 ) 2 (C 9 H 8 N 2 )]   IUCrData (2024). 9, x240849   Figure 1 Representation of (I) showing the atom-labeling scheme.Non-H atom anisotropic displacement parameters are represented at the 50% probability level.Symmetry codes: (a) 0.1 mmol) and sodium azide (13 mg, 0.2 mmol) in a mixture of water and ethanol (3:1 v/v, 20 ml).This mixture was sealed in a Teflon-lined autoclave and held at 393 K for 2 days, and then cooled to ambient temperature at a rate of 10 K h À 1 to give the product (yield 38%).

Refinement
Crystal data, data collection and refinement details are summarized in Table 3.
data reports 3 of 4

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, x240849 Refinement.H atoms bonded to C were refined using a riding model, H atoms bonded to N were freely refined.Geometric parameters (Å, º)

Table 3
Experimental details.