Spectroscopic Study of Hg (II)-Complex with 4-(dimethylamino)benzaldehyde 4-ethylthiosemicarbazone

摘要

This study reported on a newly synthesized Hg (11)- thiosemicarbazone complex. The complex was characterized using us-visible spectrophotometry. The mercury (II) - 4- (Dimethylamino)benzaldehyde 4-ethy Ithiosemicarbazone (DMABET) in methanol had a maximum absorbance (λmax) at 374 nm, whereas the λmax for DMABET in methanol was 356 nm. At optimum pH i.e. pH 4 λmax had shifted to 381 nm. The molar stoichiometry of the complex obtained by the Job's and mole ratio methods was Hg: DMABET = 1: 4. It was found from Job's method data that the stability constant of Hg(11)DMABET complex is 9.24x106 and AG = -9.55 Kcal/mol at 25 ± 2°C.