Synthesis, characterization, thermal and biological evaluation of Cu (II), Co (II) and Ni (II) complexes of azo dye ligand containing sulfamethaxazole moiety

Synthesis of azo‐functionalized ion‐imprinted polymeric resin for selective extraction of nickel(II) ions

“…However, one of the signals relating to the phenolic OH protons had disappeared, which may confirm the deprotonation of the phenolic OH groups located at the ortho position of the NN moieties during the coordination with Ni(II) ions. Similar chelation modes were previously reported for recently synthesized Ni(II) ion complexes with azo‐functionalized ligands …”

Synthesis, Characterization and Biological Studies on 3d-Metal Complexes of 5-[(1, 5-Dimethyl-3-oxo-2-Phenyl-2, 3-Dihydro-1H-Pyrazol-4-yl) Diazenyl]-1-Ethyl-6-Hydroxy-4-Methyl-2-oxo-1, 2-Dihydropyridine-3-Carbonitrile

“…we have synthesized a ligand derived from 4-amino antipyrine by simple diazo-coupling method in an acidic medium at lower temperature. It is a simple, convenient and economical method of electrophilic substitution reaction between an aromatic amine with a strong nucleophile in acidic medium at 0-5 o C as described in earlier reports [25][26][27][28][29][30][31]. An accurately weighed 0.002 mol solution of 4-aminoantipyrine (1) in dilute HCl was added to the cold solution of the NaNO 2 in 2 mL H 2 SO 4 with constant stirring at 0-5 o C for 2 h. Then, the formed diazonium salt solution was slowly added to the previously cooled solution of a coupling component ethylpyridone (2) (0.002 mol) in 5 mL aqueous KOH and stirred for another 2 h at the same temperature.…”

Synthesis, characterization and biological investigations of potentially bioactive heterocyclic compounds containing 4-hydroxy coumarin

“…The absorption maxima (λ max ) and its corresponding logarithmic molar extinction coefficient for all the compounds in studied solvents were obtained from the plot and summarized in the Table 2. The electronic spectra of the synthesized compounds showed broad peaks in the region 461-436, 389-382, 389-362 and 365-369 nm in DMSO, DMF, THF and DCM solvents due to π→π*or n→π* transitions respectively [33]. From the close observation of the spectral data (Table 2), it is clearly evident that as the polarity of the solvent increases, the absorption maxima shift towards longer wavelength so that the bathochromic shift observed in all the compounds.…”