Synthesis and Spectral Investigations of Manganese(II), Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Complexes of New Polydentate Ligands Containing a 1,8-Naphthyridine Moiety

Novel (N4) Macrocyclic Metal Complexes: Synthesis, Characterization, Spectral Studies and Anticancer Activity

“…Complex 3shows IR bands at 1383 (ν 5 ), 1296(ν 1 ), 1041(ν 2 ) cm -1 . The value of Δ(ν 5 −ν 1 ), stretching vibration is, separated by 87 cm -1 suggesting unicoordinated nitrate ion [28,29], whereas complex (9) shows IR bands at 1370 and 1284 cm -1 characterizing the ionic nitrate [13,14]. These observations are further confirmed from molar conductivities ( Table 1).…”

Synthesis and Antimicrobial Screening of the Metal Complexes with Cyanex 302

“…The low frequency skeletal vibrations due to M-O and M-S stretching provided direct evidence for the complexation. Furthermore, in the present investigation, the absence of ν(O-H) band as well as the presence of new weak bands in the 510-520 cm -1 region have been assigned to ν(M-O) vibrations [14] and the bands observed in the 406-411 cm -1 region for ν(M-S) vibrations [15] respectively. These vibrations further suggested the coordination of the Cyanex 302 anion to metal ions via sulphur and oxygen atoms.…”

Physico-Chemical Characterization and Biological Screening of Cyanex 302 complexes

“…The low frequency skeletal vibrations due to M-O and M-S stretching provided direct evidence for the complexation. The complexes contained two weak bands at 510-523 cm -1 and at 407-418 cm -1 corresponding to the ν(M-O) [15,16,17] and ν(M-S) bonds [18,19,20] respectively. The appearance of broad band at around 3357-3438 cm -1 in the spectra of Cr(II), Mn(II), Fe(II) and Cu(II) complexes, has been assigned to associated water molecules [19,21].…”

“…The brownish red iron(II) complex given only one spin allowed d-d bond at 440 nm assigned to 5 T 2g → 5 E g transition [31,32,33]. The high spin octahedral cobalt(II) complex exhibited three electronic transitions in electronic spectrum from ground state 4 T 1g (F) to the excited states 4 T 2g (F), 4 A 2g (F) and 4 T 2g (P), due to three absorption bands at 700, 515 and 446 nm respectively [18,24,26]. The electronic spectrum of the Cu(II) complex showed two bands at 640 and 530 nm, are assigned to 2 B 1 → 2 B 2 and 2 B 1 → 2 E transitions respectively, which suggested octahedral geometry [7,23,27].…”