catena-Poly[[(8-aminoquinoline-κ2 N,N′)cadmium]-di-μ-thiocyanato-κ2 N:S;κ2 S:N-[(8-aminoquinoline-κ2 N,N′)cadmium]-di-μ-chlorido]

In the title compound, [CdCl(NCS)(C9H8N2)]n, the CdII atom is in a distorted octahedral coordination environment defined by two chloride anions, two N atoms from an 8-aminoquinoline ligand, one N atom from one thiocyanate anion and one S atom from a symmetry-related thiocyanate anion. Two CdII atoms are bridged by two chloride anions, forming an inversion-related Cd2Cl2 unit; these units are further linked through thiocyanate anions, leading to a chain structure extending parallel to [010]. Weak π–π stacking interactions with centroid–centroid distances of 3.430 (4) Å and an interplanar separation of 3.390 (3) Å between the pyridine and benzene rings link the chains into a two-dimensional network parallel to (10). Weak intermolecular C—H⋯Cl hydrogen-bonding interactions help to consolidate the crystal packing.

In the title compound, [CdCl(NCS)(C 9 H 8 N 2 )] n , the Cd II atom is in a distorted octahedral coordination environment defined by two chloride anions, two N atoms from an 8-aminoquinoline ligand, one N atom from one thiocyanate anion and one S atom from a symmetry-related thiocyanate anion. Two Cd II atoms are bridged by two chloride anions, forming an inversion-related Cd 2 Cl 2 unit; these units are further linked through thiocyanate anions, leading to a chain structure extending parallel to [010]. Weakstacking interactions with centroid-centroid distances of 3.430 (4) Å and an interplanar separation of 3.390 (3) Å between the pyridine and benzene rings link the chains into a two-dimensional network parallel to (101). Weak intermolecular C-HÁ Á ÁCl hydrogenbonding interactions help to consolidate the crystal packing.
We report here the crystal structure of the title compound, [CdCl(SCN)(C 9 H 8 N 2 )] n , (I).
As shown in Fig. 1, the asymmetric unit of (I) contains one Cd II cation, one chloride anion and one thiocyanate anion. Each Cd II cation is in a distorted octahedral coordination environment defined by two chloride anions, two nitrogen atoms from one 8-aminoquinoline ligand, one nitrogen atom from one thiocyanate anion and one sulfur atom from another thiocyanate anion. Two Cd II atoms are connected by two chloride anions to form a dimer and these dimers are further bridged through two thiocyanate anions, leading to a chain structure extending parallel to [010] (Fig. 2). Moreover, weak π-π stacking interactions (centroid···centroid distances of 3.430 (4) Å and an interplanar separation of 3.390 (3) Å between pyridyl rings and benzene rings) link the chains into a two-dimensional supramolecular network in the (101) plane, which is further consolidated by intermolecular C-H···Cl hydrogen bonds to genrate a three-dimensional supramolecular structure (Fig. 3). It is interesting to note that the amino hydrogen atoms are not involved in any hydrogen bonding interactions.
Experimental 8-aminoquinoline (1 mmol) and potassium thiocyanate (1 mmol) in 20 ml methanol were added to a clear solution of cadmium chloride (1 mmol) in 20 ml methanol. Stirring was continued for 1 h; the colour changed to light yellow. The volume of the solution was reduced to 10 ml, filtered and kept for crystallization after addition of 2 drops of 2-methoxy ethanol. Colorless block-like crystals were obtained by slow evaporation of the solvent. Yield: 59%.

Refinement
All hydrogen atoms bonded to carbon were positioned geometrically and refined using a riding model, with C-H = 0.93 Å and with U iso (H) = 1.2U eq (C). The amino H atoms were found from difference maps and were refined with distance restraint of N-H = 0.86 Å and U iso (H) = 1.2U eq (N). Fig. 1. The molecular structure of the title compound, showing the atom-labelling scheme and displacement ellipsoids drawn at the 30% probability level. [Symmetry codes: (i) -x + 1, -y -1, -z + 1; (ii) -x + 1, -y, -z + 1.]  Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq