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

Abstract

The structure of the title compound is isotypic with that of the analogous nickel(II) complex, in which the CoN6 core shows an axially weakly compressed octa­hedral geometry as opposed to the almost regular geometry exhibited by the NiN6 octa­hedron.

New Cobalt(II) and Copper(II) Thiocyanate Complexes of 2,5‐Bis(pyridin‐2‐yl)‐1,3,4‐oxadiazole Ligand: Synthesis, Crystal Structures, Spectral Properties and Hirshfeld Surface Analysis

“…However, in the crystal structure of complex 1 , the bpox ligand adopts a trans conformation, and forms hydrogen bonds with the water molecule localized in the intermolecular space, as is shown in Figure . The last behaviour is in good agreement with the previously described findings in the case of the 2,5‐bis(pyridin‐2‐yl)‐1,3,4‐thiadiazole (2‐PTH) / cobalt complexes without thiocyanate ions and in the case of 2,5‐bis(pyridin‐3‐yl)‐1,3,4‐oxadiazole / cobalt complex with thiocyanate ion as coligand …”

“…In our previous papers, we have reported the synthesis of new coordination complexes derived from 2,5‐bis(pyridin‐2‐yl)‐1,3,4‐thiadiazole (2‐PTH), mono and bimetallic complexes . More recently, with the pseudohalide ions and the organic ligand, complex isotopic mononuclears M(X) 2 (2‐PTH) 2 (M=Co; Ni; Cu and X= ; SCN − ) were obtained and which one can summarize the particularities as well: i ) octahedral monometallic complexes are obtained, with 2‐PTH acting as bidendate ligand in equatorial positions and pseudohalide azide as monodendate ions in trans‐axial positions . However, the azide ion with copper, acts as bridging ligand and gives an asymmetric μ 2 ‐1,1‐azido double bridged copper (II) complex .…”

Cobalt(II) coordination complex with 2,5-bis(pyridine-2-yl)-1,3,4-thiadiazole and thiocyanate as co-ligand: Synthesis, crystal structure, Hirshfeld surface analysis, spectroscopic, thermal and magnetic properties

“…[41]. The trans behaviour was also found in the case of Co(II) coordination complex with the same investigated ligand (L) without thiocyanate ion as coligand [17,26,42].…”

“…Therefore, the CoN 6 octahedra are slightly axially compressed. This structural feature is typical for related compounds [17,26,[40][41][42], and isostructural to iron complex FeL 2 (NCS) 2 described by Klingele el al. [43].…”

“…For example, in phytopathology, we have shown that this efficiency varies according to the following sequence: NiL 2 (N 3 ) 2 > Ni 2 L 2 (H 2 O) 4 Cl 4 3H 2 O > L [23,24]. Recently, we have reported the synthesis of mono and binuclear compounds of transition metals (M = Cu, Ni and Co) with pseudo halide anions (N 3 and SCN -) as co-ligands [23][24][25][26][27][28]. The magnetic study of  2 -1,1-azido double-bridged [Cu 2 L 2 (-N 3 ) 2 (N 3 ) 2 ] complex revealed that the latter is weakly antiferromagnetic [27].…”