Stereochemical features of some nickel(II) and cobalt(II) complexes of amino ligand—2-(2-aminoethyl) pyridine—VII

The synthesis, characterization, and DC electrical conductivity of poly[di(2,5‐dimercapto‐1,3,4‐thiadiazole)‐metal] complexes

“…The charge transfer transition band showed up in the visible region for each of the four polymer‐metal complexes namely, PDMT‐Co, PDMT‐Ni, PDMT‐Cu, and PDMT‐Zn at 465, 445, 420, and 465 nm, respectively. This proves the metal complexation and that the bands are due to L→M 18, 19…”

Synthesis, Characterization, and Biological Activity of Some Transition Metal Chelates of 4‐Acyloxime‐2‐pyrazolin‐5‐ones

“…An attempt has been made to calculate important ligand field parameters using reported methods. [20] The observed bands in the electronic spectra of the nickel(II) chelates suggest octahedral stereochemistry and the bands may be assigned [21] as shown in Table 8. The observed DT/DQ values for these complexes suggest moderate distortion from the idealized cubic symmetry in these complexes.…”

“…The observed DT/DQ values for these complexes suggest moderate distortion from the idealized cubic symmetry in these complexes. [21] The splitting energy of the n 1 and n 2 bands can be used to calculate [18,21] Dt, Dq XY and Dq Z , which are listed in Table 8. The cobalt(II) spectra consist of two bands as shown [20] in Table 7.…”

“…The cobalt(II) spectra consist of two bands as shown [20] in Table 7. [18,21] The values of the ratio DT/DQ provide a measure of tetragonal distortion. 4 A 2g (F) (n 2 ) transition is a two-electron transition and thus is expected to be much weaker.…”

“…The 4 T 1g (F)! [18,21] The electronic spectral bands and their probable assignments [22,23] for each of the copper(II) chelates are listed in Table 9. In the present study, the n 2 transition remains almost unobserved Chelates of 4-Acyloxime-2-pyrazolin-5-ones 1493 using a band fitting procedure; [20] n 2 was calculated for each chelate and it is shown in Table 7.…”