Title of article :
One New Azo-azomethine Derivative for Detection of Ca2+ and Cd2+ Metal Ions: Synthesis, Characterization and DFT Studies
Author/Authors :
Shaghaghi, Zohreh Coordination Chemistry Research Laboratory - Department of Chemistry - Faculty of Basic Science - Azarbaijan Shahid Madani University - P. O. Box: 83714-161, Tabriz, Iran , Kheyrollahpoor, Mina Coordination Chemistry Research Laboratory - Department of Chemistry - Faculty of Basic Science - Azarbaijan Shahid Madani University - P. O. Box: 83714-161, Tabriz, Iran
Abstract :
One new azo Schiff-base derivative, 4-bromo-1,2-bis[2-hydroxy-5-(phenylazo)benzylideneamino]benzene (H2L), was synthesized and
characterized by common spectroscopic techniques and elemental analysis. The ability of the new chemosensor for detection of some main
and transition metal ions was studied by UV-Vis spectroscopy in the mixture of DMSO: water (9:1). Upon addition of Ca2+ and Cd2+ ions,
dramatic changes were observed in the UV-Vis spectrum of ligand (one new absorption band appeared in the range of 430-450 nm, while
the absorption band at 351 nm disappeared). The stoichiometry of the complexes was determined using the Job method. The binding
constants of Ca2+ and Cd2+ with receptor by Benesi-Hildebrand plots were found to be 2.874 × 104 M-1 and 6.445 × 104 M-1, respectively.
The results indicated the receptor can recognize Ca2+ and Cd2+ ions from other cations in aqueous solution. Finally, the structure and
electronic properties of ligand and its complexes with Ca2+ and Cd2+ ions were analyzed by DFT and TD-DFT calculations.
Keywords :
Azo-azomethine ligand , UV-Vis spectroscopy , Chemosensor , DFT calculations
Journal title :
Analytical and Bioanalytical Chemistry Research
