Spectral studies of complexes of nickel(II) with tetradentate schiff bases having N2O2 donor groups

Experimental and theoretical spectroscopic study and structural determination of nickel(II) tridentate Schiff base complexes

“…The azomethine π→π * transition band for L 1 and L 2 appeared at 389 and 459 nm, respectively. The intense bands in the range of 400-530 nm, were corresponded to π→π * azomethine and d→π * transition [24,25]. The absence of electronic transition higher than 600 nm wavelengths indicates a large crystal-field splitting and is accompanied by the square planar geometry of Ni (II) complexes [26,27].…”

Synthesis of New VO(II), Co(II), Ni(II) and Cu(II) Complexes with Isatin-3-Chloro-4-Floroaniline and 2-Pyridinecarboxylidene-4-Aminoantipyrine and their Antimicrobial Studies

“…The new bands at 530 ± 5/cm and 485 ± 5/cm have been assigned to ν(M-O) and ν(M-N) modes, respectively. A characteristic non-ligand sharp band in the spectra of VO(II) complex at 950/cm has been assigned to ν(V=O) [17-19]. …”

Synthesis and Characterization of New Macrocyclic Cu(II) Complexes from Various Diamines, Copper(II) Nitrate and 1,4‐Bis(2‐formylphenoxy)butane

“…Each metal complex shows several absorption bands in the UV-Vis region, where the 219-320 nm band seems to be due to both the π→π* and n→π* transitions of C＝N and chargetransfer transitions arising from π electron interactions between the metal and ligand which involve either a metal-to-ligand or a ligand-to-metal electron transfer. 34,35 The appearance of broad intense adsorption bands in the range 553-705 nm in the spectra of the Cu(II) complexes, respectively, which were assigned to d-d transition, seems to be little influenced by the different substitutions on the phenoxy groups, suggesting that the coordination geometry at the metal ion could be a probably a distorted octahedron. The broad, slightly intense and resolved bands between 352-458 nm may be assigned to O (phenolate) ↔ Cu(II) LMCT or MLCT.…”