Preparation and Characterization of Nickel complex with new azo ligand 1- (6-bromo-benzothiazolyl )-azo]-2-hydroxy-3-naphthoic acid (6-BrBTANA)

الملخص

A new heterocyclic azo dye 1-[(6-bromo-benzothiazolyl )-azo]-2-hydroxy-3-
naphthoic acid (6-BrBTANA) was synthesized by coupling diazotized of(2-amino-6-
bromo benzothiazol) (2-ABrBT) with 2-hydroxy-3-naphthoic acid in alkaline alcoholic
solution.The organic compound was characterized by elemental analysis and
spectrophotometric method such as Infra- red and electronic spectra . A sensitive and
selective spectrophotometric method is proposed for the rapid determination of
Nickel(II) using (6-BrBTANA), as anew spectrophotometric reagent. The reaction
between this reagent and Nickle(II) is instantaneous at max 614 nm and pH=6 to form a
violet complex having a molar ratio of 1:2 (Ni – 6-BrBTANA) .The molar absorptivity
of the complex is (1.112*104 L.mol-1.cm-1) and the stability constant was found to be
3.33*109 L2.mole-2. The physical and spectral studies of the solid complex indicated
octahedral coordination via N and O atoms of azo and hydroxyl group respectievely and
N in thiazolyl ring.