[Photometric determination of cobalt by the formation of a multi-ligand complex of Co(II)-C16H16N2S2O2-DEA].
The new ligand vanillin S-benzyldithocarbazte(HL) and its complex Co(II)-C16H16N2S2O2-DEA was synthesized and characterized by IR, UV-Vis. The optimum color conditions of the complex in 95% ethanol solution(including reaction temperature T, heating time t, and the concentrations of the three components) have been studied by quadratic regression orthogonal design method. According to the quadratic-regression equation, the maximum absorption intensity and optimum color conditions of the complex were calculated. The results were consistent with those gotten by experiment. The influences of common ions on the determination of cobalt and the methods to eliminate the influence are investigated. The maximum absorption peak of the complex is found at 404 nm and molar absorptivity is 5.29 x 10(4) L.mol-1.cm-1. Beer's law is obeyed in the range of 0-20 micrograms.(25 mL)-1 for Co(II). The composition of Co2+ to HL, and DEA in the complex is 1:2:1. The new method was successfully utilized to the determination of cobalt in VB12 and medicine.
Xue
Zhao-ming
ZM
Department of Chemistry, Anhui University, Hefei 230039, China.
Xie
An-jian
AJ
Huang
Fang-zhi
FZ
Ma
Wen
W
D001547:Benzaldehydes / Q000737:chemistry; D002614:Chelating Agents / Q000737:chemistry*; D003035:Cobalt / Q000032:analysis* / Q000737:chemistry; D004050:Ditiocarb / Q000031:analogs & derivatives* / Q000737:chemistry; D008024:Ligands; D004364:Pharmaceutical Preparations / Q000737:chemistry; D010777:Photochemistry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D014805:Vitamin B 12 / Q000737:chemistry
D001547:Benzaldehydes; D002614:Chelating Agents; D008024:Ligands; D004364:Pharmaceutical Preparations; D003035:Cobalt; D004050:Ditiocarb; C100058:vanillin; D014805:Vitamin B 12