Crystal structure of bis(azido-κN)bis[2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole-κ²N²,N³]nickel(II)

Abstract

Reaction of 2,5-bis­(pyridin-2-yl)-1,3,4-thia­diazole and sodium azide with nickel(II) triflate yielded the mononuclear title complex, [Ni(N3)2(C12H8N4S)2]. The NiII ion is located on a centre of symmetry and is octa­hedrally coordinated by four N atoms of the two bidentate heterocyclic ligands in the equatorial plane. The axial positions are occupied by the N atoms of two almost linear azide ions [N—N—N = 178.8 (2)°]. The thia­diazole and pyridine rings of the heterocyclic ligand are almost coplanar, with a maximum deviation from the mean plane of 0.0802 (9) Å. The cohesion of the crystal structure is ensured by π–π inter­actions between parallel pyridine rings of neighbouring mol­ecules [centroid-to-centroid distance = 3.6413 (14) Å], leading to a layered arrangement of the mol­ecules parallel to (001).

2-[5-(Pyridin-2-yl)-1,3,4-thiadiazol-2-yl]pyridin-1-ium perchlorate

“…Indeed, the ligand (L) can coordinate to different metal ions in many modes (Bentiss et al, 2002(Bentiss et al, , 2011Ahmed et al, 2015;Laachir et al, 2013Laachir et al, , 2015a. However, we observed the formation of the title compound with the same ligand after the addition of perchloric acid, as a result of the proton donor-acceptor reaction between perchloric acid and 2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole (L).…”

Crystal structure of bis(azido-κN)bis[2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole-κ2N2,N3]cobalt(II)

“…1) is isotypic with its nickel(II) analogue (Laachir et al, 2015) and similar to that of ISSN 2056-9890 the homologous compound, [Co(C 12 H 8 N 4 S) 2 (H 2 O) 2 ]Á2BF 4 , in which the water molecules are substituted by azide ions which at the same time neutralize the positive charge of Co 2+ (Bentiss et al, 2011b). The main difference between the two structures lies in the values of the dihedral angle between the two pyridine rings: this is 18.72 (6) in the hydrated molecule, whereas it is 3.03 (2) in the title molecule, (I).…”

Crystal structure of bis[2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole-κ2N2,N3]bis(thiocyanato-κS)copper(II)

“…The structure of the title compound is similar to that of the related complexes [Co( (Laachir et al, 2015a), in which the azide ion is substituted by the thiocyanate group. The CuN 4 S 2 octahedron is more distorted than the NiN 6 and CoN 6 octahedra.…”