Characterization and electrochemical studies of Mn(II), Co(II), Ni(II) and Cu(II) complexes with 2-mercapto-3-substituted-quinazolin-4-one and 1,10-phenanthroline or ethylenediamine as ligands

Synthesis, structure, antiproliferative activity and molecular docking of divalent and trivalent metal complexes of 4H‐3,5‐diamino‐1,2,4‐triazole and α‐hydroxynaphthaldehyde Schiff base ligand

“…The electronic absorption spectra of complexes 1 – 5 were obtained using the Nujol mull technique. For Cu(II) complex 1 , the UV–visible spectrum displayed a broad absorption band centered at 14 705 cm −1 assignable to 2 E g → 2 T 2g transition reported for octahedral configuration . The magnetic moment value of this complex was found to be 1.9 BM which is approaching the spin‐only value of sole unpaired electron predicted for Cu 2+ complexes (theoretical value is 1.72 BM).…”

Synthesis, spectral and biological studies of new Mn(II) and Fe(II) complexes of 2,3-Butanedione 3-monoxime

“…A broad band observed in both the complexes in rang ~3396 cm -1 due to (O-H) of the coordinated H 2 O. This is suppor ted by the appearance of an additional band in the rang 950-900 cm -1 for (O-H) rocking deformation and 800-750 cm -1 for (O-H) wagging mode of coordination which is not observed in the ligand spectrum 20 . Thus H 2 O is coordinated in metal complexes.…”

“…In the ligand azomethine (C=N*) group is at 1630 cm -1 wavenumber but in metal complexes it shifts to lower wavenumber, this indicates that imine nitrogen atom involved in coordination to the metal ion 18,21 while oxime (C=N) remain more or less at the same position in both ligand and metal complexes. The N-O band in ligand at 998 cm -1 but in metal complexes it shifts to higher wavenumber, this indicates that oxygen atom by replacing oxime proton involved in coordination to the metal ion 20 . A band observed in the ligand at 3296 cm -1 due to N-H group present in the imidazole ring which is rarely observed in metal complexes.…”

Synthesis, spectral and biological studies of new Mn(II) and Fe(II) complexes of 2,3-Butanedione 3-monoxime

“…In the ligand azomethine (C=N*) group is at 1630 cm -1 wavenumber but in metal complexes it shifts to lower wavenumber, this indicates that imine nitrogen atom involved in coordination to the metal ion 19,22 while oxime (C=N) remain more or less at the same position in both ligand and metal complexes. The N-O band in ligand at 998 cm -1 but in metal complexes it shifts to higher wavenumber, this indicates that oxygen atom by replacing oxime proton involved in coordination to the metal ion 21 . A band observed in the ligand at 3296 cm -1 due to N-H group present in the imidazole ring which is rarely observed in metal complexes.…”